Modeling Penumbral Microjets by Two-Fluid Simulations
We investigate how penumbral microjets, recently observed by the Hinode satellite, can be produced within sunspot penumbra. We consider two penumbral filaments with axial currents and axial flows. We assume that a vertical magnetic flux tube exists between two horizontal penumbral filaments. We also...
Saved in:
Published in | The Astrophysical journal Vol. 687; no. 2; pp. L127 - L130 |
---|---|
Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Chicago, IL
IOP Publishing
10.11.2008
University of Chicago Press |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | We investigate how penumbral microjets, recently observed by the Hinode satellite, can be produced within sunspot penumbra. We consider two penumbral filaments with axial currents and axial flows. We assume that a vertical magnetic flux tube exists between two horizontal penumbral filaments. We also assume that the axial flows are not steady; a high- velocity axial flow is imposed on the background slow axial flow. We find that this high-velocity axial flow can trigger magnetic reconnection between one penumbral filament and the vertical flux tube. As a result, inclined bidirectional jetlike flows, driven by the magnetic reconnection, propagate along the vertical magnetic flux tube. Strong proton heating, up to 25 times their original temperature, is observed in these generated jets. Conversely, the neutral-hydrogen particles are only very weakly heated. We propose that these plasma jets explain the phenomenon of penumbral microjets, recently observed by the Hinode satellite. |
---|---|
Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1538-4357 0004-637X 1538-4357 |
DOI: | 10.1086/593204 |