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)

Tuesday, February 27, 2018

Total Ionospheric Electron Content during solar eclipse 170821

With many thanks,  I refer to Iurii Cherniak and Irina Zakharenkova  2018,

 "Ionospheric Total Electron Content response to the great American solar eclipse of 21 August 2017"

doi:10.1002/2017GL075989 

http://onlinelibrary.wiley.com/doi/10.1002/2017GL075989/abstract

Abstract

Using a comprehensive database of ~4,000 ground-based Global Navigation Satellite Systems stations, we investigate the ionosphere's response to the 21 August 2017 solar eclipse. The high-resolution, two-dimensional maps of the ionospheric total electron content (TEC) were constructed using combined GPS and GLONASS measurements. Solar eclipse resulted in a continent-size TEC decrease with stronger effects up to 50% over the U.S. eastern coast. Along the totality path within an area of 75% obscuration TEC decreased by ~30–40%. We reveal a latitudinal dependence of the TEC response with equatorward expansion of TEC depletion. Recovery signature in the form of large-scale TEC enhancement up to 20–30% occurred in posteclipse period. Swarm and DMSP satellites encountered the eclipse-induced plasma density depletion and posteclipse increase at 450 km height and above. These effects were associated with downward plasma fluxes from topside ionosphere/plasmasphere and thermospheric changes.

Below adapted from Figure 1 :



Friday, February 23, 2018

Jupiter events 11 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

------
------------------------------
Introductory Radio Astronomy links:
http://herrero-radio-astronomy.blogspot.com/2015/06/introductory-radio-astronomy-references.html
Jupiter:
https://en.wikipedia.org/wiki/Jupiter
Magnetosphere of Jupiter:
https://en.wikipedia.org/wiki/Magnetosphere_of_Jupiter
Kurth et al. 2017, "The Juno Waves Investigation" 46 page pdf:
https://link.springer.com/content/pdf/10.1007%2Fs11214-017-0396-y.pdf
Connerney et al. 2017, "The Juno Magnetic Field Investigation" 100 page pdf:
https://link.springer.com/content/pdf/10.1007%2Fs11214-017-0334-z.pdf
"Properties of Decameter IIIb-III Pairs" Melnik et al. 2018 18 page pdf:
https://arxiv.org/pdf/1802.06238
"Solar Type IV bursts at frequencies 10-30 MHz" Melnik et al. 2018 51 page pdf :
https://arxiv.org/pdf/1802.06249
Links to many Juno Waves and LWA1 Jupiter spectra in this page:
http://herrero-radio-astronomy.blogspot.com/2018/02/jupiter-events-10-at-juno-waves-and.html
Links to many Sun Earth Jupiter posts:
http://herrero-radio-astronomy.blogspot.com/2017/12/sun-earth-jupiter-20171223.html
--------------------------------
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
http://herrero-radio-astronomy.blogspot.com/2017/11/jupiter-events-7-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2018/01/jupiter-events-8-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2018/01/jupiter-events-9-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2018/02/jupiter-events-10-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2018/02/jupiter-events-11-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
http://herrero-radio-astronomy.blogspot.com/2017/11/jupiter-events-8-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
-----












Saturday, February 10, 2018

Jupiter events 10 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

------
------------------------------
--
Introductory Radio Astronomy links:
http://herrero-radio-astronomy.blogspot.com/2015/06/introductory-radio-astronomy-references.html
Jupiter:
https://en.wikipedia.org/wiki/Jupiter
Magnetosphere of Jupiter:
https://en.wikipedia.org/wiki/Magnetosphere_of_Jupiter
Kurth et al. 2017, "The Juno Waves Investigation" 46 page pdf:
https://link.springer.com/content/pdf/10.1007%2Fs11214-017-0396-y.pdf
Connerney et al. 2017, "The Juno Magnetic Field Investigation" 100 page pdf:
https://link.springer.com/content/pdf/10.1007%2Fs11214-017-0334-z.pdf
Links to many Juno Waves and LWA1 Jupiter spectra in this page:
http://herrero-radio-astronomy.blogspot.com/2018/01/jupiter-events-8-at-juno-waves-and.html
Links to my many Sun Earth Jupiter posts:
http://herrero-radio-astronomy.blogspot.com/2017/12/sun-earth-jupiter-20171223.html
--------------------------------

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
http://herrero-radio-astronomy.blogspot.com/2017/11/jupiter-events-7-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2018/01/jupiter-events-8-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2018/01/jupiter-events-9-at-juno-waves-and.html
http://herrero-radio-astronomy.blogspot.com/2018/02/jupiter-events-10-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
http://herrero-radio-astronomy.blogspot.com/2017/11/jupiter-events-8-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
-----










---

Monday, February 5, 2018

Sun Earth Jupiter 20180205

...

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/2017/12/sun-earth-jupiter-20171223.html 
  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
 
...

------------------------------

Introductory Radio Astronomy links:
http://herrero-radio-astronomy.blogspot.com/2015/06/introductory-radio-astronomy-references.html
Jupiter:
https://en.wikipedia.org/wiki/Jupiter
Magnetosphere of Jupiter:
https://en.wikipedia.org/wiki/Magnetosphere_of_Jupiter
Kurth et al. 2017, "The Juno Waves Investigation" 46 page pdf:
https://link.springer.com/content/pdf/10.1007%2Fs11214-017-0396-y.pdf
Connerney et al. 2017, "The Juno Magnetic Field Investigation" 100 page pdf:
https://link.springer.com/content/pdf/10.1007%2Fs11214-017-0334-z.pdf
Links to many Juno Waves and LWA1 Jupiter spectra in this page:
http://herrero-radio-astronomy.blogspot.com/2018/01/jupiter-events-8-at-juno-waves-and.html
Links to my many Sun Earth Jupiter posts:
http://herrero-radio-astronomy.blogspot.com/2017/12/sun-earth-jupiter-20171223.html
--------------------------------
----------------------------
Flux computation example , Nancay Decametric Array :
25 MHz , 100 data units , source in beam axis
calibrated with 50.71 dB 300 kelvin calibrator , ~ 165 data units
Flux = NoiseTemperature*Boltzman/Bandwidth/EffectiveArea
NoiseTemperature = 10^(DataUnits*0.046) kelvin
Boltzman = 1.38E-23 joule/kelvin
Bandwidth = 1E5 hertz
EffectiveArea at 25MHz ~ 3.3E3 meter^2
area is proportional to cosine^2(angle from line of sight to antenna axis) , antenna axis point to 20 degrees south of zenith
Flux = 3.98E4*1.38E-23/1E5/3.3E3 = 1.66E-27 watt/hertz/meter^2
--------------------------------







---