Ultra-Low-Frequency Solar He II 30.4 nm Pulsations

Details Ultra-Low-Frequency Solar He II 30.4 nm Pulsations Ultra-Low-Frequency Solar He II 30.4 nm Pulsations

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...670.1414g&link_type=abstract

The Astrophysical Journal, Volume 670, Issue 2, pp. 1414-1419.

Astronomy and Astrophysics

Astronomy

1

Sun: Oscillations, Sun: Transition Region, Sun: Uv Radiation

Scientific paper

Solar EUV and X-ray measurements from the Charge, Element and Isotope Analysis System/Solar EUV Monitor (CELIAS/SEM) on board Solar and Heliospheric Observatory (SOHO) and the Geostationary Operational Environmental Satellites (GOES) have been studied for four time periods. Two ultra-low-frequency CELIAS/SEM He II 30.4 nm pulsations were observed with frequencies of 0.02316+/-0.00232 and 0.00926+/-0.00232 mHz during days 244-248 of 1999 and 89-93 of 2003, respectively. The He II 30.4 nm pulsation lifetimes were found to be of the order of a few days. The frequencies of the observed EUV pulsations are in the frequency range of the solar g-modes. The short lifetimes of these He II 30.4 nm pulsations, however, do not match the expected long lifetimes of solar g-modes. No statistically significant peak was found in the GOES X-ray data.

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