Solar Cycle Variations of the Occurrence of Coronal Type III Radio Bursts and a New Solar Activity Index

Details Solar Cycle Variations of the Occurrence of Coronal Type III Radio Bursts and a New Solar Activity Index Solar Cycle Variations of the Occurrence of Coronal Type III Radio Bursts and a New Solar Activity Index

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh13b1974l&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH13B-1974

Astronomy and Astrophysics

Astrophysics

[7500] Solar Physics, Astrophysics, And Astronomy, [7534] Solar Physics, Astrophysics, And Astronomy / Radio Emissions, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle, [7599] Solar Physics, Astrophysics, And Astronomy / General Or Miscellaneous

Scientific paper

The results of studies of solar cycle variations of the occurrence rate of coronal type III radio bursts are presented. The radio spectra are provided by the Learmonth Solar Radio Observatory (Western Australia), part of the USAF Radio Solar Telescope Network (RSTN). It is found that the occurrence rate of type III bursts strongly correlates with solar activity. However, the profiles for the smoothed type III burst occurrence rate differ considerably from those for the sunspot number, 10.7 cm solar radio flux, and solar flare index. The type III burst occurrence rate (T3BOR) is proposed as a new index of solar activity. T3BOR provides complementary information about solar activity and should be useful in different studies including solar cycle predictions and searches for different periodicities in solar activity. This index can be estimated from daily results of the Automated Radio Burst Identification System (ARBIS). Access to data from other RSTN sites will allow processing 24-hour radio spectra in near-real time and estimating true daily values of this index. It is also shown that coronal type III bursts can even occur when there are no visible sunspots on the Sun. However, no evidence is found that the bursts are not associated with active regions. It is also concluded that the type III burst productivity of active regions exhibits solar cycle variations.

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