Solar Cycle Variation in Solar f-Mode Frequencies and Radius
Basu, Sarbani; Antia, H. M.; Pintar, J.; Pohl, B.
India, United States
Abstract
Using data from the Global Oscillation Network Group (GONG) covering the period from 1995 to 1998, we study the change with solar activity in solar f-mode frequencies. The results are compared with similar changes detected from the Michelson Doppler Imager (MDI) data. We find variations in f-mode frequencies which are correlated with solar activity indices. If these changes are due to variation in solar radius then the implications are that the solar radius decreases by about 5 km from minimum to maximum activity.