Solar Radio Spikes in 2.6 - 3.8 GHz during the 13 December 2006 Event

Details Solar Radio Spikes in 2.6 - 3.8 GHz during the 13 December 2006 Event Solar Radio Spikes in 2.6 - 3.8 GHz during the 13 December 2006 Event

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008soph..253..133w&link_type=abstract

Solar Physics, Volume 253, Issue 1-2, pp. 133-141

Physics

7

Sun, Flare, Radio Emission, Spikes

Scientific paper

On 13 December 2006, some unusual radio bursts in the range 2.6 - 3.8 GHz were observed during an X3.4 flare/CME event from 02:30 to 04:30 UT in active region NOAA 10930 (S06W27) with the digital spectrometers of the National Astronomical Observatories of China (NAOC). During this event many spikes were detected with the high temporal resolution of 8 ms and high frequency resolution of 10 MHz. Many of them were found to have complex structures associated with other radio burst types. The new observational features may reflect certain emission signatures of the electron acceleration site. In this paper, we present the results of the analysis of the new observational features of the complex spikes. According to the observed properties of the spikes, we identify five classes. Their observational parameters, such as duration, bandwidth, and relative bandwidth, were determined. Most spikes had negative polarization, but spikes with positive polarization were observed during a short time interval and were identified as a separate class. Based on the analysis of observations with Hinode/SOT (Solar Optical Telescope) we suggest that the sources of the spikes with opposite polarizations were different. Combined observations of spikes and fiber bursts are used to estimate the magnetic field strength in the source.

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