EUV sprays: jet-like eruptive activity on the solar limb

R. A. Harrison, P. Bryans, R. Bingham

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Jet-like eruptive events have been detected in the extreme ultraviolet (EUV) observations from the Solar and Heliospheric Observatory (SOHO) spacecraft. Some jet-like events are shown and for one event, that of January 22 2000, we provide a detailed analysis of the EUV observations. The January 22 observation was part of an on-going campaign to observe the onset of coronal mass ejections (CMEs) using extreme ultraviolet spectroscopy. A high-temperature fan-like jet was first detected in emission lines from plasmas at one million K and over, and it appears to be the onset of a narrow mass ejection identified later in coronagraph data. This was followed by a dramatic jet or finger of cool ($\le$250 000 K), rotating plasma which extended vertically, high into the corona. It extended well beyond the field of view of the instrument and appears to relate to a small ejected cloud which is detected in subsequent coronagraph data. The spectroscopic characteristics are used to provide plasma diagnostic information for these two events, and this combined with images for a wide range of temperatures allows a thorough investigation of the processes leading to such eruptions. A simple accreting magnetic field model is used to descibe the basic features of the jet activity.
LanguageEnglish
Pages324-335
Number of pages12
JournalAstronomy and Astrophysics
Volume379
Issue number1
DOIs
Publication statusPublished - 3 Nov 2001

Fingerprint

solar limb
spray
sprayers
limb
coronagraphs
plasma
rotating plasmas
SOHO Mission
plasma diagnostics
ultraviolet spectroscopy
coronal mass ejection
field of view
fans
ejection
volcanic eruptions
coronas
corona
spacecraft
volcanic eruption
observatory

Keywords

  • UV radiation
  • solar corona
  • solar atmosphere
  • sun

Cite this

Harrison, R. A. ; Bryans, P. ; Bingham, R. / EUV sprays : jet-like eruptive activity on the solar limb. In: Astronomy and Astrophysics. 2001 ; Vol. 379, No. 1. pp. 324-335.
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EUV sprays : jet-like eruptive activity on the solar limb. / Harrison, R. A.; Bryans, P.; Bingham, R.

In: Astronomy and Astrophysics, Vol. 379, No. 1, 03.11.2001, p. 324-335.

Research output: Contribution to journalArticle

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