High-temperature corona associated with a loop prominence system

Journal Article · Sun Apr 15 04:00:00 EST 1979 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/157015· OSTI ID:6251687

Chapman, R D; Neupert, W M

Flare-associated coronal loops were observed on the Se limb of the Sun of 1972 February 9 by the Goddard X-ray and EUV spectroheliograph on board OSO 7. The loop structure is clearly visible in the lines of Mg VII and Mg IX, whereas little or no detail is observed in Fe XV and Fe XVI. A looplike structure with a cloud of emission at the top is observedin soft X-rays. The temperature structure in the region has been calculated from the ratio Fe XVI/Fe XV. The isothermal controur plot is strikingly similar to the isointensity contour plots of the soft X-ray spectroheliograms. With these temperatures and the Fe XV intensity calculated from a calibration scheme developed by Chapman and Neupert, the emission measure has been estimated in the loops. Calculated energy losses suggest that continued deposition of energy is required over the observing period.

• Research Organization: Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Greenbelt, Maryland
• OSTI ID: 6251687
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 229:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CRYOGENIC FLUIDS
ELECTRON DENSITY
ELEMENTS
FLUIDS
HELIUM
IRON
METALS
NONMETALS
RARE GASES
SOLAR ACTIVITY
SOLAR CORONA
SOLAR FLARES
SOLAR PROMINENCES
SPECTRA
TRANSITION ELEMENTS
ULTRAVIOLET SPECTRA
X-RAY SPECTRA