HR: 1340h
AN: SH53A-1067    [Abstracts]
TI: Solar He II 30.4 nm Pulsation Frequency Spectrum
AU: * Gangopadhyay, P
EM: pradip@usc.edu
AF: University of Southern California, Space Sciences Center, University Park, Los Angeles, CA 90089-1341, United States
AU: Judge, D
EM: djudge@usc.edu
AF: University of Southern California, Space Sciences Center, University Park, Los Angeles, CA 90089-1341, United States
AB: We have recently found evidence for solar He II 30.4 nm pulsations from a Fourier transform study of CELIAS/SEM 26-34 nm EUV data. We have now calculated the frequency spectrum of the He II 30.4 nm pulsations during selected days in the solar cycle 23. We will present the CELIAS/SEM EUV flux data and the amplitudes, the frequencies and the phases of the pulsations. The frequencies of the observed pulsations are found to be less than the Brunt-Vaissala frequency. Various pulsation parameters obtained during different phases of the solar cycle will be compared.
DE: 7539 Stellar astronomy
DE: 7546 Transition region
DE: 7549 Ultraviolet emissions
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting