Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983cha%26a...7..120y&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 7, Issue 2, p. 120-123.
Astronomy and Astrophysics
Astrophysics
Scientific paper
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.
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