Skylab XUV observations of densities, thermal structure, and mass motions in a compact flare

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165609· OSTI ID:5748220

Widing, K G; Cook, J W

The extensive series of slit spectra of the energetic limb flare of December 17, 1973 obtained by Skylab is studied, and the December 17, 1973 flare is reconsidered in the light of these new data. Examples of the flare morphology observed in He II, NeIV, and Mg VII are contrasted with the morphology observed in Fe XVII. Slit profiles of Fe XXI 1354 A, O V 1371 A, and Si IV 1403 A are presented, and Fe XXI line widths are compared with the Doppler-widened kernel widths observed with the spectroheliograph. The electron density at selected phases is derived from diagnostic line ratios of O IV, O V, S IV, and S V observed in the slit spectra, and the density distribution in the flare between 10 to the 5th-6th K is obtained. The flare morphology is reexamined, and the arch structure within the 5 x 5 arcsec kernel is resolved. An improved picture of the density spatial structure of the flare kernel is derived. 26 references.

• Research Organization: E.O. Hulburt Center for Space Research, Washington, DC
• OSTI ID: 5748220
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 320; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DENSITY
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELEMENTS
IONIZING RADIATIONS
IRON
MASS TRANSFER
METALS
MORPHOLOGY
PHYSICAL PROPERTIES
RADIATIONS
SATELLITES
SKYLAB
SOLAR ACTIVITY
SOLAR FLARES
SPECTRA
TRANSITION ELEMENTS
ULTRAVIOLET SPECTRA
X RADIATION