Transient coronal extreme ultraviolet emission before and during the impulsive phase of a solar flare

Journal Article · Fri Sep 01 04:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167819· OSTI ID:5356922

Neupert, W M ^[1]

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1. NASA, Goddard Space Flight Center, Greenbelt, MD (USA)

Transient coronal EUV emission, recorded in an emission line of Fe XI at 180.4 A, has been observed prior to and during the initial stages of a solar flare. This emission provides direct evidence of the interactions between the lower corona and the chromosphere during flare initiation. The first EUV enhancement was correlated with activation and eruption of a filament, extended over a distance of about 120,000 km, and had an emission maximum at the site of filament disruption. A moving source of EUV emission also appeared along the trajectory of the erupting filament as it accelerated through the low corona. The mass of this source is estimated to be greater than that of the initial filament or surrounding corona, implying an additional mass ejection from the chromosphere. EUV emission during the impulsive phase of the flare consisted of transient sources along the photospheric magnetic neutral line, with intervening regions of lesser intensity that are interpreted as transient coronal loops below the erupting filament. 60 refs.

• OSTI ID: 5356922
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 344; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BALMER LINES
ELECTROMAGNETIC RADIATION
EXTREME ULTRAVIOLET RADIATION
IONIZING RADIATIONS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
RADIATIONS
SOLAR ACTIVITY
SOLAR CORONA
SOLAR FLARES
SOLAR PROMINENCES
STELLAR ATMOSPHERES
STELLAR CORONAE
ULTRAVIOLET RADIATION
X RADIATION