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)

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