Temporal and spatial relationships between O V and Fe XXI emissions in solar flares

Journal Article · Fri Jan 01 04:00:00 EST 1988 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/165969· OSTI ID:5332893

Cheng, C; Pallavicini, R

The temporal-spatial structure of simple solar flares observed with the Ultraviolet Spectrometer and Polarimeter of the Solar Maximum mission satellite has been studied in order to investigate the relationships between the impulsive O V and the gradual Fe XXI emissions. The point-like flares are characterized by the cotemporal evolution of the O V and Fe XXI emissions. The simple loop flares have a much larger spatial extent and show two distinctive phases: an initial impulsive phase with its emission localized in loop footpoints, and a gradual phase with its emission distributed in the loop. The temporal evolution of the Fe XXI and O V emissions in a flare is found to be closely related to its spatial structure. 41 references.

• Research Organization: E. O. Hulburt Center for Space Research, Washington, DC (USA); Arcetri, Osservatorio Astrofisico, Florence (Italy)
• OSTI ID: 5332893
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 324; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
IONIZING RADIATIONS
IRON
METALS
NONMETALS
OXYGEN
RADIATIONS
SOLAR ACTIVITY
SOLAR FLARES
SPATIAL DISTRIBUTION
SPECTRA
TRANSITION ELEMENTS
ULTRAVIOLET SPECTRA
X RADIATION