What determines the penumbral size and Evershed flow speed?

Details What determines the penumbral size and Evershed flow speed? What determines the penumbral size and Evershed flow speed?

2011-02-15

arxiv.org/abs/1102.3164v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

5 pages, 5 figures, IAU 273 proceedings, in press

Scientific paper

Using Hinode SP and G-band observations, we examined the relationship between magnetic field structure and penumbral size 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.

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