A Magnetohydrodynamic Model Focused on the Configuration of Magnetic Field Responsible for a Solar Penumbral Microjet

In order to understand the configuration of magnetic field producing a solar penumbral microjet that was recently discovered by Hinode, we performed a magnetohydrodynamic simulation reproducing a dynamic process of how that configuration is formed in a modeled solar penumbral region. A horizontal ma...

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Bibliographic Details
Published inAstrophysical journal. Letters Vol. 715; no. 1; pp. L40 - L43
Main Author Magara, T
Format Journal Article
LanguageEnglish
Published United States IOP Publishing 20.05.2010
Subjects
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
ATMOSPHERES
FLUID MECHANICS
HYDRODYNAMICS
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC RECONNECTION
MAGNETOHYDRODYNAMICS
MAIN SEQUENCE STARS
MATHEMATICS
MECHANICS
SIMULATION
SOLAR ACTIVITY
STARS
STARSPOTS
STELLAR ACTIVITY
STELLAR ATMOSPHERES
SUN
SUNSPOTS
THREE-DIMENSIONAL CALCULATIONS
TOPOLOGY
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ISSN2041-8205
2041-8213
DOI10.1088/2041-8205/715/1/L40

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Summary:In order to understand the configuration of magnetic field producing a solar penumbral microjet that was recently discovered by Hinode, we performed a magnetohydrodynamic simulation reproducing a dynamic process of how that configuration is formed in a modeled solar penumbral region. A horizontal magnetic flux tube representing a penumbral filament is placed in a stratified atmosphere containing the background magnetic field that is directed in a relatively vertical direction. Between the flux tube and the background field there forms the intermediate region in which the magnetic field has a transitional configuration, and the simulation shows that in the intermediate region magnetic reconnection occurs to produce a clear jet-like structure as suggested by observations. The result that a continuous distribution of magnetic field in three-dimensional space gives birth to the intermediate region producing a jet presents a new view about the mechanism of a penumbral microjet, compared to a simplistic view that two field lines, one of which represents a penumbral filament and the other the background field, interact together to produce a jet. We also discuss the role of the intermediate region in protecting the structure of a penumbral filament subject to microjets.
ISSN:2041-8205
2041-8213
DOI:10.1088/2041-8205/715/1/L40