Waves as the source of apparent twisting motions in sunspot penumbrae

Details Waves as the source of apparent twisting motions in sunspot penumbrae Waves as the source of apparent twisting motions in sunspot penumbrae

2012-04-10

arxiv.org/abs/1204.2221v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication in Astrophysical Journal on 8th April 2012

Scientific paper

The motion of dark striations across bright filaments in a sunspot penumbra has become an important new diagnostic of convective gas flows in penumbral filaments. The nature of these striations has, however, remained unclear. Here we present an analysis of small scale motions in penumbral filaments in both simulations and observations. The simulations, when viewed from above, show fine structure with dark lanes running outwards from the dark core of the penumbral filaments. The dark lanes either occur preferentially on one side or alternate between both sides of the filament. We identify this fine structure with transverse (kink) oscillations of the filament, corresponding to a sideways swaying of the filament. These oscillations have periods in the range of 5-7 min and propagate outward and downward along the filament. Similar features are found in observed G-band intensity time series of penumbral filaments in a sunspot located near disk center obtained by the Broadband Filter Imager (BFI) on board {\it Hinode}. We also find that some filaments show dark striations moving to both sides of the filaments. Based on the agreement between simulations and observations we conclude that the motions of these striations are caused by transverse oscillations of the underlying bright filaments.

Affiliated with

Also associated with

No associations

Rating

Waves as the source of apparent twisting motions in sunspot penumbrae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Waves as the source of apparent twisting motions in sunspot penumbrae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Waves as the source of apparent twisting motions in sunspot penumbrae will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-645756