Chromospheric jets around the edges of sunspots

Morton, Richard (2012) Chromospheric jets around the edges of sunspots. Astronomy & Astrophysics, 543 (A6). ISSN 0004-6361

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Aims. Evidence is beginning to be put forward that demonstrates the role of the chromosphere in supplying energy and mass to the corona. We aim to asses the role of chromospheric jets in active region dynamics.

Methods. Using a combination of the Hinode/SOT Ca II H and TRACE 1550 Å and 1600 Å filters we examine chromospheric jets situated at the edge of a sunspot.

Results. Analysis reveals a near continuous series of jets, that raise chromospheric material into the low corona above a sunspot. The jets have average rise speeds of 30 km/s
and a range of 10−100 km/s. Enhanced emission observed at the jets leading edge suggests the formation of a shock front. Increased emission in TRACE bandpasses above the sunspot and the disappearance of the jets from the Ca II filter suggests that some of the chromospheric jet material is at least heated to ∼ 0.1 MK. The evidence suggests that the jets could be a mechanism which provides a steady, low-level heating for active region features.

Item Type: Article
Uncontrolled Keywords: magnetohydrodynamics (MHD), plasmas, shock waves, Sun: chromosphere, sunspots
Subjects: F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Related URLs:
Depositing User: Dr Richard Morton
Date Deposited: 04 Oct 2012 15:02
Last Modified: 17 Dec 2023 13:01

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