A Transition Region Explosive Event Observed in He II with the MOSES Sounding Rocket Authors

Loading...
Thumbnail Image

Date

2010-07-27

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

Transition region explosive events (EEs) have been observed with slit spectrographs since at least 1975, most commonly in lines of C IV (1548 Å, 1550 Å) and Si IV (1393 Å, 1402 Å). We report what we believe to be the first observation of a transition region EE in He II 304 Å. With the Multi­Order Solar EUV Spectrograph (MOSES) sounding rocket, a novel slitless imaging spectrograph, we are able to see the spatial structure of the event. We observe a bright core expelling two jets that are distinctly non­collinear, in directions that are not anti­parallel. The jets have sky­plane velocities of order 75 km s­1 and line­of­sight velocities of +75 km s­1 (blue) and ­30 km s­1 (red). The core is a region of high non­thermal Doppler broadening, characteristic of EEs, with maximal broadening 380 km s­1 FWHM. It is possible to resolve the core broadening into red and blue line­of­sight components of maximum Doppler velocities +160 km s1 and ­220 km s­1. The event lasts more than 150 s. Its properties correspond to the larger, long­lived, and more energetic EEs observed in other wavelengths.

Description

Keywords

Citation

Fox, J. Lewis, Charles C. Kankelborg, and Roger J. Thomas. “ A TRANSITION REGION EXPLOSIVE EVENT OBSERVED IN He II WITH THE MOSES SOUNDING ROCKET .” The Astrophysical Journal 719, no. 2 (July 27, 2010): 1132–1143. doi:10.1088/0004-637x/719/2/1132.
Copyright (c) 2002-2022, LYRASIS. All rights reserved.