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Paper: Evidence of Enhanced High Frequency Velocity Oscillations in the Sun Observed During Solar Flares Using Disk-Integrated Doppler Signals
Volume: 416, Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21
Page: 333
Authors: Kumar, B.; Venkatakrishnan, P.
Abstract: Disk integrated velocity signals at the solar surface obtained from Global Oscillation Network Group (GONG) full-disk Dopplergrams have been used to study the flare-induced velocity oscillations during the major solar flare (X17.6/4B) of 28 October 2003. We observe that these velocity oscillations are enhanced significantly during the flare in the higher frequency band (5-6.5 mHz) while there is feeble or no enhancement of these oscillations in lower frequency band (2-4 mHz). We also observe the presence of high frequency power in these velocity oscillations of the Sun comparable to granulation power even in non-flaring condition.
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