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)

Wednesday, March 6, 2013

Discussion of solar type classification at the 130306 Radio JOVE Telephone Conference

I link to Culgoora's Solar Observatory (Narrabri New South Wales Australia) Brief Introduction of Radiospectrogram Analysis. It has beautiful spectral examples:

I summarize the classification as follows:

Type III is by far the most common type we observe with Radio JOVE Instruments. It is defined as a burst with fast negative frequency drift (high to low frequency). Observers plotting two frequencies in their Sky Pipe charts or dual frequency audio records will notice the drift. There is no precise number for the frequency drift, it varies with event and frequency.
41 posts about type III at:

Type II is beautiful, but much less common, it has slow negative frequency drift (relative to type III). Sometimes we can observe its fundamental and second harmonic in spectra.
22 posts about type II at:

Type V is brief continuum (featureless across the band, in spectral records). It sometimes follows type III bursts.

Type IV is long duration continuum, 4 posts at:

Type I is difficult to observe near 20 MHz, it is more frequently seen above 40 MHz. See this post about it:

Types VI and VII are used by NOAA Space Weather Prediction Center for set of many type III and V, lasting many minutes:

Type  VI: Series of Type III bursts over a period of 10 minutes or more, with no period longer than 30 minutes without activity.

Type VII: Series of Type III and Type V bursts over a period of 10 minutes or more, with no period longer than 30 minutes without activity.