Electron density diagnositc line ratios from the n = 3 lines of O v

Journal Article · Tue Jun 15 04:00:00 EDT 1982 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/160041· OSTI ID:7062479

Widing, K G; Doyle, J G; Dufton, P L; Kingston, A E

New atomic physic calculations are presented for electron excitation rates for transitions between the n = 2 and n = 3 levels of O v. These are used to calculate theoretical line intensity ratios for the 192 A, 215 A, 220 A and 248 A lines of O v. These line intensity ratios are electron density sensitive and provide valuable diagnostics at T/sub e/approx.2 x 10/sup 5/ K for samll impulsive flare events in which the transition zone ions are enhanced relative to the coronal ions. Two flares observed by NRL spectroheliograph on Skylab, on 1973 December 22 and 1974 January 21, are studied, with electron densities of approximately 3 x 10/sup 11/ cm/sup -3/ being deduced.

• Research Organization: E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington
• OSTI ID: 7062479
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 257:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CHARGED PARTICLES
COLLISIONS
ELECTRON COLLISIONS
ELECTRON DENSITY
ELECTRON-ION COLLISIONS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FUNCTIONS
ION COLLISIONS
IONS
MATRICES
OXYGEN IONS
R MATRIX
SOLAR ACTIVITY
SOLAR FLARES
SPECTRA
ULTRAVIOLET SPECTRA
WAVE FUNCTIONS