Hercules A

Hercules A
Radio-Optical View of the Galaxy Hercules A - Many thanks to: NASA, ESA, S. Baum and C. O'Dea (RIT), R. Perley and W. Cotton (NRAO/AUI/NSF), and the Hubble Heritage Team (STScI/AURA)

Monday, October 23, 2017

A first study of Jupiter 160827 at NASA PDS and Kurth et al. 2017 "A new view..."

-----
With many thanks from Victor Herrero-Arrieta to the Teams at Juno Waves, NASA Planetary Data System, STEREO A,  WIND, and the Tax Payers of the United States of America.

With many thanks, Victor Herrero-Arrieta acknowledges the Nançay Radio Observatory / Unité Scientifique de Nançay of the Observatoire de Paris (USR 704-CNRS, supported by Université d’Orléans, OSUC, and Région Centre in France) for providing access to NDA observations accessible online at http://www.obs-nancay.fr
------
Magnetosphere of Jupiter :
https://en.wikipedia.org/wiki/Magnetosphere_of_Jupiter
Jupiter events at Juno Waves and other observatories :
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-1-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-2-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-3-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-4-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/10/jupiter-events-5-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/10/jupiter-events-6-at-juno-waves-and.html
Jupiter events at the University of Iowa Space Physics LWA1 Data Project :
http://herrero-radio-astronomy.blogspot.com/2017/08/jupiter-events-1-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/08/jupiter-events-2-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-3-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-4-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-5-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-6-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-7-at-university-of-iowa.html
Examples of Jupiter events observed by Juno Waves :
http://herrero-radio-astronomy.blogspot.com/2017/05/examples-of-jupiter-events-observed-by.html
-----

I refer to Kurth et al. 2017 "A new view of Jupiter’s auroral radio spectrum"

"...3. Discussion and Summary

187 The Juno Waves observations from perijove 1 reveal an overall structure for non-Io
188 related Jovian auroral radio emissions that consists primarily of V-shaped emissions in
189 frequency-time spectrograms in which the vertex falls close to the local electron cyclotron
190 frequency where the emissions are generally more intense. The intensification and the proximity
191 of the emission to fce provide the suggestion that at these times the spacecraft is close to a source
192 region. For some of the events, closer inspection shows the emission is at or even below fce and
193 the electron distribution function sometimes shows down-going beams and up-going loss cones.
194 Louarn et al. [2017] show that loss cone distributions observed in the vicinity of Event C are
195 sufficient to drive the cyclotron maser instability. Mauk et al. [2017] report loss cone features in
196 the more energetic electron observations made by the JEDI instrument at similar times as those
197 of interest, here. Hence, it will be important to consider the full range of electron distributions
198 before a final assessment of the distribution responsible for the radio emissions. We note,
199 however, that for the possible sources noted in the present work, the fact that the radio emissions
200 are not far below fce, hence, the resonant electrons cannot be much above the JADE electron
201 energy range.
202 The V-shaped emissions observed are almost certainly the result of the relative motion of
203 Juno with respect to CMI sources having thin conical sheet beaming patterns with large opening
204 angles [Kaiser and MacDowall, 1998; Queinnec and Zarka, 1998]. There are V-shaped
205 emissions both near AKR sources at Earth and Saturn, although these are typically filled as
206 opposed to the narrow features in Figure 2. Louis et al. [this issue] shows that some decametric
207 emissions near Perijove 1 have V-shaped emissions that are well modeled by simulations. This
208 suggests the V-shape may be related to sources that are restricted to one or a small set of field
209 lines. Future work will include modeling the frequency-time structure with tools such as those
210 described by Louis et al. [this issue] and Imai et al. [2017 a, b].
211 While there are few specific spectral features that provide accurate plasma frequencies, it
212 appears that fpe is of order 20 kHz throughout the Jovian polar region, hence, fce >> fpe for at least
213 events B and C. The situation is similar to that at Saturn where the density is so low that there is
214 no need for plasma cavities such as occur over Earth’s auroral regions to meet the fce >> fpe
215 requirement for the cyclotron maser instability.
216 Hess et al. [2008] examine various mechanisms by which electron acceleration events
217 observed by the Galileo plasma instrument near Io might generate CMI emissions. Provided the
218 plasma density in the source region is sufficiently low that Earth-like plasma cavities are not
219 required, they favor an oblique instability driven by heating which generates emissions with
220 beaming angles that vary along the Io flux tube with smaller angles at larger magnetic field
221 strengths (lower altitudes, higher frequencies). While the emissions reported herein are not Io
222 related, it is likely similar conical beaming occurs.
223 The first examination of radio emissions from low altitude, high latitude with Juno
224 provided an illuminating view of V-shaped frequency-time structures with vertices near fce and
225 sometimes covering virtually the full spectral range from kilometric to decametric frequencies.
226 Juno came at least close to up to five radio sources over about 18 hours near closest approach.
227 For some of the near-source crossings, electron observations at energies of a few to 10’s of keV
228 show loss cone and beam features that are reminiscent of terrestrial auroral kilometric sources.
229 Louarn et al. [2017] provide evidence that the distribution for Event C is sufficient to drive the
230 cyclotron maser instability, consistent with the observed emissions. It remains to model the
231 observed sources, as done by Louis et al. [this issue] for Io related emissions, to show that they
232 can result in the V-shaped frequency-time structures and to further investigate the energetic
233 electron distributions for their ability to drive the radio emissions. These observations, however,
234 serve to confirm that the CMI process is a universal process for the generation of auroral radio
235 emissions..."



----

Thursday, October 12, 2017

Jupiter events 6 at Juno Waves and other observatories

-----
With many thanks from Victor Herrero-Arrieta to the Teams at Juno Waves, NASA Planetary Data System, STEREO A,  WIND, and the Tax Payers of the United States of America.

With many thanks, Victor Herrero-Arrieta acknowledges the Nançay Radio Observatory / Unité Scientifique de Nançay of the Observatoire de Paris (USR 704-CNRS, supported by Université d’Orléans, OSUC, and Région Centre in France) for providing access to NDA observations accessible online at http://www.obs-nancay.fr
------
Magnetosphere of Jupiter :
https://en.wikipedia.org/wiki/Magnetosphere_of_Jupiter
Jupiter events at Juno Waves and other observatories :
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-1-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-2-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-3-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-4-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/10/jupiter-events-5-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/10/jupiter-events-6-at-juno-waves-and.html
Jupiter events at the University of Iowa Space Physics LWA1 Data Project :
http://herrero-radio-astronomy.blogspot.com/2017/08/jupiter-events-1-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/08/jupiter-events-2-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-3-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-4-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-5-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-6-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-7-at-university-of-iowa.html
Examples of Jupiter events observed by Juno Waves :
http://herrero-radio-astronomy.blogspot.com/2017/05/examples-of-jupiter-events-observed-by.html
-----







About the usual names and fluxes for the planetary radio emission bands :





I refer to Kurth et al. 2017 "A new view of Jupiter’s auroral radio spectrum"

"...3. Discussion and Summary

187 The Juno Waves observations from perijove 1 reveal an overall structure for non-Io
188 related Jovian auroral radio emissions that consists primarily of V-shaped emissions in
189 frequency-time spectrograms in which the vertex falls close to the local electron cyclotron
190 frequency where the emissions are generally more intense. The intensification and the proximity
191 of the emission to fce provide the suggestion that at these times the spacecraft is close to a source
192 region. For some of the events, closer inspection shows the emission is at or even below fce and
193 the electron distribution function sometimes shows down-going beams and up-going loss cones.
194 Louarn et al. [2017] show that loss cone distributions observed in the vicinity of Event C are
195 sufficient to drive the cyclotron maser instability. Mauk et al. [2017] report loss cone features in
196 the more energetic electron observations made by the JEDI instrument at similar times as those
197 of interest, here. Hence, it will be important to consider the full range of electron distributions
198 before a final assessment of the distribution responsible for the radio emissions. We note,
199 however, that for the possible sources noted in the present work, the fact that the radio emissions
200 are not far below fce, hence, the resonant electrons cannot be much above the JADE electron
201 energy range.
202 The V-shaped emissions observed are almost certainly the result of the relative motion of
203 Juno with respect to CMI sources having thin conical sheet beaming patterns with large opening
204 angles [Kaiser and MacDowall, 1998; Queinnec and Zarka, 1998]. There are V-shaped
205 emissions both near AKR sources at Earth and Saturn, although these are typically filled as
206 opposed to the narrow features in Figure 2. Louis et al. [this issue] shows that some decametric
207 emissions near Perijove 1 have V-shaped emissions that are well modeled by simulations. This
208 suggests the V-shape may be related to sources that are restricted to one or a small set of field
209 lines. Future work will include modeling the frequency-time structure with tools such as those
210 described by Louis et al. [this issue] and Imai et al. [2017 a, b].
211 While there are few specific spectral features that provide accurate plasma frequencies, it
212 appears that fpe is of order 20 kHz throughout the Jovian polar region, hence, fce >> fpe for at least
213 events B and C. The situation is similar to that at Saturn where the density is so low that there is
214 no need for plasma cavities such as occur over Earth’s auroral regions to meet the fce >> fpe
215 requirement for the cyclotron maser instability.
216 Hess et al. [2008] examine various mechanisms by which electron acceleration events
217 observed by the Galileo plasma instrument near Io might generate CMI emissions. Provided the
218 plasma density in the source region is sufficiently low that Earth-like plasma cavities are not
219 required, they favor an oblique instability driven by heating which generates emissions with
220 beaming angles that vary along the Io flux tube with smaller angles at larger magnetic field
221 strengths (lower altitudes, higher frequencies). While the emissions reported herein are not Io
222 related, it is likely similar conical beaming occurs.
223 The first examination of radio emissions from low altitude, high latitude with Juno
224 provided an illuminating view of V-shaped frequency-time structures with vertices near fce and
225 sometimes covering virtually the full spectral range from kilometric to decametric frequencies.
226 Juno came at least close to up to five radio sources over about 18 hours near closest approach.
227 For some of the near-source crossings, electron observations at energies of a few to 10’s of keV
228 show loss cone and beam features that are reminiscent of terrestrial auroral kilometric sources.
229 Louarn et al. [2017] provide evidence that the distribution for Event C is sufficient to drive the
230 cyclotron maser instability, consistent with the observed emissions. It remains to model the
231 observed sources, as done by Louis et al. [this issue] for Io related emissions, to show that they
232 can result in the V-shaped frequency-time structures and to further investigate the energetic
233 electron distributions for their ability to drive the radio emissions. These observations, however,
234 serve to confirm that the CMI process is a universal process for the generation of auroral radio
235 emissions..."




-----

Monday, October 2, 2017

Jupiter events 5 at Juno Waves and other observatories

-----
With many thanks from Victor Herrero-Arrieta to the Teams at Juno Waves, NASA Planetary Data System, STEREO A,  WIND, and the Tax Payers of the United States of America.

With many thanks, Victor Herrero-Arrieta acknowledges the Nançay Radio Observatory / Unité Scientifique de Nançay of the Observatoire de Paris (USR 704-CNRS, supported by Université d’Orléans, OSUC, and Région Centre in France) for providing access to NDA observations accessible online at http://www.obs-nancay.fr
------
Jupiter events at Juno Waves and other observatories :
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-1-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-2-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-3-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-4-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2017/10/jupiter-events-5-at-juno-waves-and.html
Jupiter events at the University of Iowa Space Physics LWA1 Data Project :
http://herrero-radio-astronomy.blogspot.com/2017/08/jupiter-events-1-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/08/jupiter-events-2-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-3-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-4-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-5-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-6-at-university-of-iowa.html
http://herrero-radio-astronomy.blogspot.com/2017/09/jupiter-events-7-at-university-of-iowa.html
Examples of Jupiter events observed by Juno Waves :
http://herrero-radio-astronomy.blogspot.com/2017/05/examples-of-jupiter-events-observed-by.html
-----

Jupiter 160826 at Juno Waves, STEREO A, WIND, Paris Observatory :
 


Jupiter 161210 at Juno Waves and Long Wavelength Array :

Jupiter 170123 at Juno Waves and LWA1 :


With many thanks to Jeremy Faden and Chris Piker, University of Iowa Autoplot Project, Juno Waves perijoves 160827 161211 170202, 7E1 to 4.1E7 hertz :









---

Sun Earth Jupiter 20170926

Many thanks to: Taxpayers of the United States of America, the Juno, STEREO, WIND Spacecraft Teams, the Panetary Data System Team,  Prof. Dr. Kazumasa Imai Kochi National College of Technology Kochi Japan, Trinity College Dublin Ireland Astrophysics Group, United States NOAA SWPC, NASA Solar Dynamics Observatory Teams, Lockheed Martin Solar Laboratory, SOTERIA Project

With many thanks, Victor Herrero-Arrieta acknowledges the Nançay Radio Observatory / Unité Scientifique de Nançay of the Observatoire de Paris (USR 704-CNRS, supported by Université d’Orléans, OSUC, and Région Centre in France) for providing access to NDA observations accessible online at http://www.obs-nancay.fr 

Many thanks to: Taxpayers of France, French Air Force, Nancay Decametric Array Team at the Nancay Radio Astronomy Station of Paris Observatory. 

More on this subject:
http://herrero-radio-astronomy.blogspot.com/2017/09/sun-earth-jupiter-20170926.html
http://herrero-radio-astronomy.blogspot.com/2017/08/sun-earth-jupiter-20170831.html
http://herrero-radio-astronomy.blogspot.com/2015/08/links-to-monthly-sun-earth-jupiter-posts.html?m=1

...













Jupiter, Mercury, and solar coronal streamers at SOHO C3 , 171014-171017 :

Jupiter will be in conjunction with Sun October 26. We have observed Jupiter decametric events very near conjunction in the past, it is unlikely but possible. Paris Observatory continues to support Juno Waves with Jupiter observations from the Nancay Decametric Array.


Jupiter Mercury and CME at SOHO C3 171015-171018 :


...
Links to earlier Sun Earth Jupiter event posts:

http://herrero-radio-astronomy.blogspot.com/2015/08/links-to-monthly-sun-earth-jupiter-posts.html?m=1
 

Sunday, October 1, 2017

A very good page about radio spectrography by Nathan Towne

Please see:

http://myplace.frontier.com/~nathan56/SDRPlay2RSS/doc/SDRPlay2RSS.html

This is an active page, the latest change log is dated 170913.

"...This program acquires time-domain data from the SDRPlay receiver, computes spectra, and pipes the spectra to Radio Sky Spectrograph (RSS)..."

SDRplay purchase and specification links for the 3 models:

http://www.sdrplay.com/purchase/ 

http://www.sdrplay.com/docs/SDRplay_datasheet.pdf

http://www.sdrplay.com/docs/161115%20RSP2%20flyerV3a.pdf

http://www.sdrplay.com/wp-content/uploads/2016/12/161214RSP2and2ProDatasheet.pdf

--------------------------------
Introductory Radio Astronomy references
http://herrero-radio-astronomy.blogspot.com/2015/06/introductory-radio-astronomy-references.html?m=1
Juno Jupiter observations, examples and papers
http://herrero-radio-astronomy.blogspot.com/2017/05/examples-of-jupiter-events-observed-by.html examples
http://agupubs.onlinelibrary.wiley.com/hub/journal/10.1002/(ISSN)1944-8007/issues/   V44I10 Juno at Jupiter
Jupiter events at STEREO A and WIND for correlation with Juno Waves
http://herrero-radio-astronomy.blogspot.com/2017/07/jupiter-events-at-stereo-and-wind-for.html
More links to Juno related posts
http://herrero-radio-astronomy.blogspot.com/2016/01/links-to-juno-related-posts.html?m=1
Sun Earth Jupiter event posts:
http://herrero-radio-astronomy.blogspot.com/2017/09/sun-earth-jupiter-20170926.html
http://herrero-radio-astronomy.blogspot.com/2017/08/sun-earth-jupiter-20170831.html
http://herrero-radio-astronomy.blogspot.com/2015/08/links-to-monthly-sun-earth-jupiter-posts.html?m=1
Solar Cycle 24
https://en.wikipedia.org/wiki/Solar_cycle_24
"The Solar Cycle" by David Hathaway 2015, 81 pages
http://arxiv.org/pdf/1502.07020v1
Driel-Gesztelyi and Green 2015 "Evolution of Active Regions" 98 pages, 11 MB:
http://link.springer.com/content/pdf/10.1007%2Flrsp-2015-1.pdf
Links to recent Solar Radio Science Highlights by Eduard Kontar
http://herrero-radio-astronomy.blogspot.com/2017/02/links-to-recent-solar-radio-science.html
Solar Type Examples
http://herrero-radio-astronomy.blogspot.com/2015/07/solar-type-examples.html
Solar Dynamics Observatory - Now and Daily - Images Movies
http://sdo.gsfc.nasa.gov/data/
NOAA SWPC Solar Event reports with README description of their format
ftp://ftp.swpc.noaa.gov/pub/indices/events/
Eclipse 170821
http://herrero-radio-astronomy.blogspot.com/2017/09/radio-observations-during-total-solar.html Observations
http://herrero-victor.blogspot.com/2016/10/preparation-for-eclipse-170821.html  Preparations
http://herrero-victor.blogspot.com/2017/08/the-august-21-2017-eclipse-party-at.html Eclipse Party
-----------------------------

Introductory Radio Astronomy References

Last updated  171015

"Essential Radio Astronomy" Condom and Ransom
https://science.nrao.edu/opportunities/courses/era
http://www.cv.nrao.edu/course/astr534/ERA_old.shtml
NRAO Learning Resources
https://science.nrao.edu/opportunities/courses
NRAO Research Highlights
https://science.nrao.edu/science/highlights

Radio Astronomy
https://en.wikipedia.org/wiki/Radio_astronomy

Magnetosphere of Jupiter
https://en.wikipedia.org/wiki/Magnetosphere_of_Jupiter
Jupiter
https://en.wikipedia.org/wiki/Jupiter
Juno Waves Instrument
https://en.wikipedia.org/wiki/Waves_(Juno)


Juno Jupiter observations, examples and papers
http://herrero-radio-astronomy.blogspot.com/2017/05/examples-of-jupiter-events-observed-by.html examples
http://agupubs.onlinelibrary.wiley.com/hub/issue/10.1002/grl.v44.10/ Juno Issue

Jupiter events at STEREO A and WIND for correlation with Juno Waves
http://herrero-radio-astronomy.blogspot.com/2017/07/jupiter-events-at-stereo-and-wind-for.html
More links to Juno related posts
http://herrero-radio-astronomy.blogspot.com/2016/01/links-to-juno-related-posts.html?m=1

Sun Earth Jupiter event posts:
http://herrero-radio-astronomy.blogspot.com/2017/10/sun-earth-jupiter-20171021.html
http://herrero-radio-astronomy.blogspot.com/2017/09/sun-earth-jupiter-20170926.html
http://herrero-radio-astronomy.blogspot.com/2017/08/sun-earth-jupiter-20170831.html
http://herrero-radio-astronomy.blogspot.com/2015/08/links-to-monthly-sun-earth-jupiter-posts.html?m=1

Solar Cycle 24
https://en.wikipedia.org/wiki/Solar_cycle_24
"The Solar Cycle" by David Hathaway 2015, 81 pages
http://arxiv.org/pdf/1502.07020v1
Driel-Gesztelyi and Green 2015 "Evolution of Active Regions" 98 pages, 11 MB:
http://link.springer.com/content/pdf/10.1007%2Flrsp-2015-1.pdf

Links to recent Solar Radio Science Highlights by Eduard Kontar
http://herrero-radio-astronomy.blogspot.com/2017/02/links-to-recent-solar-radio-science.html

Solar Type Examples
http://herrero-radio-astronomy.blogspot.com/2015/07/solar-type-examples.html
Solar Dynamics Observatory - Now and Daily - Images Movies
http://sdo.gsfc.nasa.gov/data/
NOAA SWPC solar reports with README description of their format:
Solar event reports


Eclipse 170821
http://herrero-radio-astronomy.blogspot.com/2017/09/radio-observations-during-total-solar.html Observations
http://herrero-victor.blogspot.com/2016/10/preparation-for-eclipse-170821.html  Preparations
http://herrero-victor.blogspot.com/2017/08/the-august-21-2017-eclipse-party-at.html Eclipse Party