2010/03/11 by Brajesh Kumar, Kumar, Brajesh, S. Mathur +7
Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #Ionosphere and magnetosphere dynamics #Oceanographic and Atmospheric Processes #Solar and Space Plasma Dynamics #Solar and Stellar Astrophysics (astro-ph.SR) #astro-ph.SR
paper · pdf · doi:10.48550/arxiv.1003.2263
4 pages, 3 figures, Submitted to the "Proceedings of the Fourth HELAS International Conference" organized by the Instituto de Astrofísica de Canarias (IAC) during 1-5 February, 2010.
arxiv created 2010/03/11 · openalex publication_date 2010/03/11 · arxiv updated 2010/03/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The study of low-degree high-frequency waves in the Sun can provide new insight into the dynamics of the deeper layers of the Sun. Here, we present the analysis of the velocity observations of the Sun obtained from the Michelson and Doppler Imager (MDI) and Global Oscillations at Low Frequency (GOLF) instruments on board Solar and Heliospheric Observatory (SOHO) spacecraft for the major flare event of 2003 October 28 during the solar cycle 23. We have applied wavelet transform to the time series of disk-integrated velocity signals from the solar surface using the full-disk Dopplergrams obtained from MDI. The wavelet power spectrum computed from MDI velocity series clearly shows that there is enhancement of high-frequency global waves in the Sun during the flare. We do observe this signature of flare in the Fourier Power Spectrum of these velocity oscillations. However, the analysis of disk-integrated velocity observations obtained from GOLF shows only feeble effect of flare on high-frequency oscillations.