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, August 30, 2011

Io-D predictions with Radio-Jupiter Pro 3

I thank Jim Sky for help with this Post.

I refer to:
Physics of the Jovian Magnetosphere, Edited by A.J. Dessler, 1983:
This Monograph is available in part at this location:
Google Books: "Physics of the Jovian Magnetosphere"

Table 7.4, page 255, in Chapter 7:  "Phenomenology of magnetospheric radio emission"  by Carr Desch and Alexander, contains the Io-D region definition used in Radio-Jupiter Pro 3:

The prediction is done by using a "mode file" that defines the parameters for the Io-D region.  In Radio-Jupiter Pro 3, click on File and you will see options to load  and edit the mode files.  The default mode file is the University of Florida Radio Observatory  file, but there is another file with Io-D parameters.  Below are the mode parameters for the UF_IoD.JMF  file, located  at:

The file can be downloaded and saved in the Radio-Jupiter Pro 3 directory.  Then the user can do a File / Load Mode File operation to make it active.

Here is an example of a prediction for August 25 2011, at Nice France :

Friday, August 26, 2011

Nice 2 hour long Io-D arc with pure Left Circular Polarization - strong Solar activity - at Nancay on 110825

Io-D events are not seen frequently at Nancay.
This one did not reach 20 MHz, but came close.
I do not know of any Radio JOVE observations of Io-D.
I look forward to studying the first one, some day.
Io-D is located roughly left of Io-B in the CML/Io-phase map.
It is radiated by southern magnetic hemisphere Cyclotron Masers, seen along one side of the Masers radiation cones (same side as Io-B but opposite hemisphere).
For 12 earlier post about Io-D events please see:


My thanks to the Nancay Radio Astronomy Station of Paris Observatory

Tuesday, August 23, 2011

Monday, August 22, 2011

Coordinated Observations of Io-B on 110821, remotely from Windward Community College Radio Observatory in Hawaii USA, while I was in Pincher Creek Alberta Canada

I obtained wonderful results during my remote observations, in the company of a total of about 8 Radio JOVE Observers, including myself (considering the whole Conference that lasted almost 2 hours for me).

I connected via Gmail Voice Video instead of my usual Skype (free call for me).

A great success, many thanks to Dr. James Thieman, Goddard Space Flight Center, for organizing this great event !

The graphics below were created in real time during the Conference, I show a sample of nice activity periods.

Tuesday, August 16, 2011

Monday, August 15, 2011

Io-A low pass and Io-C, at Nancay on 110815

Io-A is Right Circular Polarized but Io-C should be Left CP. This is based on Cyclotron Maser Theory. I do not know why this happens frequently, which makes it worth studying.

My thanks to the Nancay Radio Astronomy Station of Paris Observatory

Sunday, August 14, 2011

Io-B at AJ4CO Observatory on 110814

I thank Jim Thieman for organizing the Radio JOVE Coordinated Observing Telecon, and Dave Typinski for publishing his streamed two dipole array data.

The graphics below were generated in real time during the conference.

UT-7 Pacific time on this spectrum

Friday, August 12, 2011

Wednesday, August 10, 2011

X6.9 flare on 110809

Eruptive X6.9, AR1263 , N17W71, Peak@ 08:05 9-August-2011
Three frames from:

Tuesday, August 9, 2011

Beautiful Io-B at Nancay on 110809

Detail from the Azuma/Imai/Warwick map

My thanks to the Nancay Radio Astronomy Station of Paris Observatory

Monday, August 8, 2011

Nice Io-C at Nancay on 110808

Comparable strength in Right and Left circular polarization, with different slopes
Weak ionospheric modulations in LCP