Evershed Flow Revealed by the Solar Optical Telescope aboard Hinode

Details Evershed Flow Revealed by the Solar Optical Telescope aboard Hinode Evershed Flow Revealed by the Solar Optical Telescope aboard Hinode

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008asthe.101..378i&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 101, No. 7, p. 378 - 384 (2008)

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Evershed Flow

Scientific paper

The Evershed flow, which was discovered about 100 years ago, is still a mystery on its origin. The Solar Optical Telescope (SOT) aboard Hinode revealed the fine scale structure of the Evershed flow and its relation to the filamentary structures of the sunspot penumbra. The Evershed flow is confined in narrow channels embedded in deep penumbra that have nearly horizontal magnetic fields. It is a dynamic phenomenon with the flow velocity close to the sound speed of the photosphere, and individual flow channels are associated with tiny upflow of hot gas (source) at the inner end and down flow (sink) at the outer end. SOT/Hinode also discovered the enigmatic twisting motions of penumbral filaments and numerous tiny jets in the penumbral chromosphere. The SOT opened a new step towards the understanding of the sunspots, though further studies with magnetohydrodynamic modeling are necessary.

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