Adiabatic heating in impulsive solar flares

Technical Report · Mon Aug 01 04:00:00 EDT 1977

OSTI ID:5109639

Maetzler, C; Bai, T; Crannell, C J; Frost, K J

The dynamic X-ray spectra of two simple, impulsive solar flares are examined together with H alpha, microwave and meter wave radio observations. X-ray spectra of both events were characteristic of thermal bremsstrahlung from single temperature plasmas. The symmetry between rise and fall was found to hold for the temperature and emission measure. The relationship between temperature and emission measure was that of an adiabatic compression followed by adiabatic expansion; the adiabatic index of 5/3 indicated that the electron distribution remained isotropic. Observations in H alpha provided further evidence for compressive energy transfer.

• Research Organization: National Aeronautics and Space Administration, Greenbelt, Md. (USA). Goddard Space Flight Center
• OSTI ID: 5109639
• Report Number(s): N-7731063; NASA-TM-X-71380; X-660-77-203
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ADIABATIC PROCESSES
ATMOSPHERES
BALMER LINES
BREMSSTRAHLUNG
ELECTROMAGNETIC RADIATION
MICROWAVE RADIATION
MICROWAVE SPECTRA
PHOTOSPHERE
RADIATIONS
RADIOWAVE RADIATION
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR FLARES
SPECTRA
X-RAY SPECTRA