Victor Herrero Radio Astronomy Blog: 2018

Saturday, December 22, 2018

Jupiter events 23 at Juno Waves and other observatories

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
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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
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Saturday, November 17, 2018

Sun 201811

With many thanks to NASA Solar Dynamics Observatory and European Space Agency PROBA Teams.

Earlier on Sun events:
https://herrero-radio-astronomy.blogspot.com/2018/03/sun-earth-jupiter-20180330.html

1:

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Sunday, October 14, 2018

Jupiter events 22 at Juno Waves and other observatories

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

10:

11:

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Thursday, August 23, 2018

Jupiter events 21 at Juno Waves and other observatories

10:

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12: About the origin of Jupiter's magnetic field

I take note of the links to 26 presentations given at the Juno Europlanet Meeting 2018:

https://www2.le.ac.uk/departments/physics/people/leighfletcher/ras-juno-europlanet-meeting-2018

The presentation by Chris Jones, University of Leeds in the United Kingdom, shows 16 slides about Jupiter's magnetic field, slide 3 describes the origin of Jupiter and Saturn magnetic fields in the very different metallic regions of hydrogen and helium:

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15:

16:

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Thursday, August 2, 2018

Sun Earth Jupiter 20180330

...

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/2018/02/sun-earth-jupiter-20180205.html
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
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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 Juno Waves and LWA1 Jupiter spectra:
http://herrero-radio-astronomy.blogspot.com/2018/03/jupiter-events-14-at-juno-waves-and.html
Links to Sun Earth Jupiter posts:
http://herrero-radio-astronomy.blogspot.com/2017/12/sun-earth-jupiter-20171223.html
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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
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5: Cycle 24 seen at 10.7 cm - the weakest solar cycle in 70 years !!

6: The Maunder 70 year sunspot number minimum- 1645 to 1715 :(
From Fig 38, Hathaway 2015 "The Solar Cycle", many thanks
The Sun is a mystery inside an enigma !!
Study also: "Leif Svalgaard's Research Page" http://www.leif.org/research/

9: About the latitude distribution of sunspot area centroids during solar cycles
From Fig 31, Hathaway 2015 "The Solar Cycle", many thanks
Generally more than 20 degrees at the beginning, less than 10 degrees at the end

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11:

12:

About the beginning and end of Solar Cycle 24

Please read also:
https://en.wikipedia.org/wiki/Solar_cycle_24

Studying the Dominion Radio Astrophysical Observatory (Penticton British Columbia Canada) 10.7 cm adjusted monthly average radio flux, I find December 2008 had 66.89 solar flux units (1E-22 watt/hertz/meter^2):

http://www.spaceweather.ca/solarflux/sx-5-mavg-en.php

It was the lowest adjusted monthly average flux during the cycle 23 to 24 transition period.

I declare December 2008 is my beginning of cycle 24, because I prefer a Radio Astronomy method rather than sunspot method :)

If cycle 24 is an exactly 11 year cycle, I expect it will end December of 2019, using my 10.7 cm flux criterion.
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