Abstract
We have analyzed disk-integrated velocity signals at the solar surface obtained from full-disk Doppler images as observed with MDI (Michelson and Doppler Imager) on board SoHO (Solar and Heliospheric Observatory) to study the effect of solar flares on acoustic velocity oscillations. It is seen that during a flare these oscillations are enhanced significantly in the higher frequency band, beyond the acoustic cut-off-frequency in the solar photosphere of about 5mHz, while there is feeble to no enhancement of these oscillations in the 5-min (3.3mHz) band. Enhancement in the high-frequency component of the acoustic spectrum of the Sun during major flares has also been reported recently in disk-integrated intensity observations of the Sun.
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Kumar, B., Venkatakrishnan, P. (2010). Flare-Driven Acoustic Modes in the Sun. In: Hasan, S., Rutten, R. (eds) Magnetic Coupling between the Interior and Atmosphere of the Sun. Astrophysics and Space Science Proceedings. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02859-5_41
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DOI: https://doi.org/10.1007/978-3-642-02859-5_41
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