A model of the spectrum of the slowly varying component of solar radio emission from active regions |
| |
| Institution: | Purple Mountain Observatory, Academia Sinica China |
| |
| Abstract: | Statistical analyses of solar radio observations have shown that proton events are likely to occur when the flux at 3 cm, S3, of the SVC is greater than 25 sfu and when S3/S8 is grater than 1. A theoretical explanation of this fact is attempted in this paper. I calculated the spectrum of the SVC using the gyro-radiation emission and found that the main reason for S3 >; 25sfu is a ten-fold increase in the conductive energy flux in the active region over the quiet region, raising the height of the gyro-resonance layer for the 3 cm emission, and that the main reason for S3/S8 ? 1 is an increase in the coronal magnetic field gradient in the active region, causing a decrease in the optical thickness for the gyro-resonance absorption at 3 cm. It is precisely these active regions that are most favourable for the production of proton events. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
