Low-frequency oscillations in active regions and their possible relation to quasi-stationary flows

Details Low-frequency oscillations in active regions and their possible relation to quasi-stationary flows Low-frequency oscillations in active regions and their possible relation to quasi-stationary flows

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..883k&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

Oscillation, Penumbra, Evershed Flows

Scientific paper

For purposes of local helioseismology, where sunspots can play the role of seismic probe, it is necessary to have a detailed knowledge of the oscillation characteristics in the sunspot, especially in its penumbra. At the same time one more type of regular motion of solar plasma (in addition to oscillations) is often observed in sunspot penumbra. It is represented by a radial outflow of material at the photospheric level and an inflow in the chromosphere. We have investigated the line-of-sight velocity oscillations in penumbrae of several sunspots and its neighboring. Particular emphasis has been placed on the low-frequency portion of the spectrtum (0.4-2.4 mHz). Aside from standard method ("doppler compensator"), the authors used the differential method to separate the oscillations associated with Evershed flows from those of a different nature. A comparative analysis made for several tens of time series for the period 1999-2001 showed that photospheric and chromospheric line-of-sight velocity oscillations in the range of Evershed flows have much in common. It is possible to identify three groups of the most frequently occurring periods: 20-40, 12-15, and 7-10 minute. These are the periods which are the main candidates for the connection with Evershed flows.

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