11:30 AM - 11:45 AM
[PEM19-04] Comparison between Polarization and Spectral Characteristics
of Zebra Pattern in Solar Radio Bursts
Keywords:Solar corona, Radio bursts, polarization, AMATERAS
In Kaneda et al. (2015, ApJL), we analyzed polarization characteristics of a ZP event and suggested from its frequency dependence that the ZP was originally generated polarized in the O-mode and was partly converted into the X-mode near the emission source. In order to examine these results, we analyzed totally 17 ZP events observed with AMATERAS, a solar radio telescope developed by Tohoku University in the frequency range of 100-500 MHz (Iwai et al., 2012). The analysis was made focused on three aspects: degree of circular polarization, temporal delay between the two polarization components and frequency separation between adjacent stripes. We derived these three parameters using highly resolved spectral data from AMATERAS. As a result, we found the following characteristics; degree of polarization in the range of 10-80%, temporal delay of 0-70 ms and frequency separation of 1-5 MHz, and that these characteristics of ZP were rather different from event to event. The difference in these parameters implies the difference in physical mechanisms at a certain stage of the generation of ZP emission. Based on the obtained results, possible generation mechanisms of ZP will be discussed.