Astronomy and Astrophysics – Astronomy
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640308d&link_type=abstract
American Astronomical Society, AAS Meeting #216, #403.08; Bulletin of the American Astronomical Society, Vol. 41, p.879
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent observations (e.g., Wang et al. 2004; Deng et al. 2005) have shown that there is a sudden penumbral decay associated with major flares during which the overall magnetic field inclination in penumbra changes due to magnetic reconnection. We propose that the size (i.e., length) of sunspot penumbra is related to the localized magnetic field configuration. In order to test this hypothesis, we study 11 sunspots close to disk center with different sizes, which were observed by Hinode/SOT at the late phase of solar cycle 23. We notice that even for typical alpha sunspots near the disc center, the penumbral length is different in different sectors in the same spot. Since the Evershed flow is coupled with penumbra, we also study the properties of Evershed flow, such as its speed, at different location of a sunspot. The SP data is used to study the magnetic field parameters (e.g., strength, inclination) in different penumbral sectors that show distinct penumbral length. The Evershed flow is measured both by Doppler shift from SP observation and by Local Correlation Tracking based on time series of BFI data. We aim to find the relationship among magnetic field topology, penumbral size, and Evershed flow speed.
Choudhary D.
Deng Nimao
Shimizu Toshifumi
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