Simultaneous ultraviolet line and hard x-ray bursts in the impulsive phase of solar flares

Journal Article · Tue Feb 01 04:00:00 EST 1983 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/160696· OSTI ID:6085211

Woodgate, B E; Shine, R A; Poland, A I; Orwig, L E

Several fast impulsive phase solar flare bursts were observed by the Solar Maximum Mission instruments on 1980 November 8. The bursts were seen to be coincident in the O V 1371 A line formed at 2.5 x 10/sup 5/ K and in 25--300 keV X-rays, to within the resolution time of 1 s. This lack of time difference is inconsistent with models for these flares in which the hard X-rays are produced at the top of a loop, followed by the formation of a thermal conduction front which travels to the footpoint where a UV burst is produced by heating. Models in which both X-rays and UV radiation are produced at the footpoint, or an electron beam transmits energy between loop top and footpoint is less than 1 s, are allowed.

• OSTI ID: 6085211
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 265:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY TRANSFER
HARD X RADIATION
HEAT TRANSFER
IONIZING RADIATIONS
RADIATIONS
SOLAR ACTIVITY
SOLAR FLARES
SOLAR X-RAY BURSTS
SPECTRA
THERMAL CONDUCTION
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA
X RADIATION
X-RAY SPECTRA