What determines the penumbral size and Evershed flow speed?

Na Deng, Toshifumi Shimizu, Debi Prasad Choudhary, Haimin Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Using Hinode SP and G-band observations, we examined the relationship between magnetic field structure and penumbral length as well as Evershed flow speed. The latter two are positively correlated with magnetic inclination angle or horizontal field strength within 1.5 kilogauss, which is in agreement with recent magnetoconvective simulations of Evershed effect. This work thus provides direct observational evidence supporting the magnetoconvection nature of penumbral structure and Evershed flow in the presence of strong and inclined magnetic field.

Original languageEnglish (US)
Title of host publicationThe Physics of Sun and Star Spots
PublisherCambridge University Press
Pages216-220
Number of pages5
EditionS273
ISBN (Print)9780521760621
DOIs
StatePublished - Aug 2011

Publication series

NameProceedings of the International Astronomical Union
NumberS273
Volume6
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: atmospheric motions
  • Sun: magnetic fields
  • Sun: photosphere.
  • Sunspots

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