Quantitative Examination of a Large Sample of Supra-Arcade Downflows in Eruptive Solar Flares

Дата и время публикации : 2011-01-07T21:57:59Z

Авторы публикации и институты :
Sabrina L. Savage
David E. McKenzie

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: Submitted to ApJ — 33 pages, 13 figures
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: Sunward-flowing voids above post-coronal mass ejection (CME) flare arcades were first discovered using the soft X-ray telescope (SXT) aboard Yohkoh and have since been observed with TRACE (extreme ultra-violet (EUV)), SOHO/LASCO (white light), SOHO/SUMER (EUV spectra), and Hinode/XRT (soft X-rays (SXR)). Supra-arcade downflow (SAD) observations suggest that they are the cross-sections of thin flux tubes retracting from a reconnection site high in the corona. Supra-arcade downflowing loops (SADLs) have also been observed under similar circumstances and are theorized to be SADs viewed from a perpendicular angle. Previous studies have presented detailed SAD observations for a small number of flares. In this paper we present a substantial SADs and SADLs flare catalog. We have applied semi-automatic detection software to several of these events to detect and track individual downflows thereby providing statistically significant samples of parameters such as velocity, acceleration, area, magnetic flux, shrinkage energy, and reconnection rate. We discuss these measurements, how they were obtained, and potential impact on reconnection models.

Category: Physics