Frequencies of low-degree solar acoustic oscillations and the phase of the solar cycle |
| |
Authors: | Martin F Woodard |
| |
Institution: | (1) Solar Astronomy 264-33, California Institute of Technology, 91125 Pasadena, CA, USA |
| |
Abstract: | A study of the solar total irradiance data of the Active Cavity Radiometer Irradiance Monitor (ACRIM) on the Solar Maximum Mission (SMM) satellite shows a small but formally significant shift in the frequencies of solar acoustic (p-mode) oscillations between the epochs of maximum and minimum solar activity. Specifically, the mean frequency of the strongest p-mode resonances of low spherical-harmonic degree (l = 0–2) is approximately 1.3 parts in 104 higher in 1980, near the time of sunspot maximum, than in 1985, near sunspot minimum. The observed frequency shift may be an 11-yr effect but the precise mechanism is not clear. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|