Solar He II 30.4 nm Pulsation Frequency Spectrum

Details Solar He II 30.4 nm Pulsation Frequency Spectrum Solar He II 30.4 nm Pulsation Frequency Spectrum

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh53a1067g&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH53A-1067

Astronomy and Astrophysics

Astronomy

7539 Stellar Astronomy, 7546 Transition Region, 7549 Ultraviolet Emissions

Scientific paper

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.

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