Temporal correlations between impulsive ultraviolet and hard X-ray bursts in solar flares observed with high time resolution

Journal Article · Fri Jul 01 00:00:00 EDT 1988 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/166486· OSTI ID:6833381

Cheng, C C; Vanderveen, K; Orwig, L E; Tandberg-Hanssen, E

The impulsive phase of solar flares has been simultaneously observed in the ultraviolet O V line, the UV continuum, and hard X-rays with a time resolution of 0.128 s by the SMM satellite. A close time correspondence between the three impulsive components is found, with the best correlation being at the peak of the impulsive phase. Individual bursts or fast features in the O V and the UV continuum are shown to lag behind the corresponding hard X-ray features. None of the considered energy transport mechanisms (thermal conduction, a nonthermal electron beam, electron hole boring, UV radiation, and Alfven waves) are able to consistently account for the observed temporal correlations. 30 references.

• Research Organization: E. O. Hulburt Center for Space Research, Washington, DC (UAS); California Institute of Technology, Pasadena (USA); NASA, Goddard Space Flight Center, Greenbelt, MD (USA); NASA, Marshall Space Flight Center, Huntsville, AL (USA)
• OSTI ID: 6833381
• Journal Information: Astrophys. J.; (United States), Vol. 330
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SOLAR FLARES
HARD X RADIATION
ULTRAVIOLET RADIATION
ALFVEN WAVES
ELECTRON BEAMS
ENERGY TRANSFER
SATELLITES
THERMAL CONDUCTIVITY
BEAMS
ELECTROMAGNETIC RADIATION
HYDROMAGNETIC WAVES
IONIZING RADIATIONS
LEPTON BEAMS
PARTICLE BEAMS
PHYSICAL PROPERTIES
RADIATIONS
SOLAR ACTIVITY
THERMODYNAMIC PROPERTIES
X RADIATION
640104* - Astrophysics & Cosmology- Solar Phenomena