Authors
Citation
D. Marocchi et al., NONEQUILIBRIUM IONIZATION AND ELECTRON-DENSITY IN THE CORONAL PLASMA DURING SOLAR-FLARES, Nuovo cimento della Societa italiana di fisica. D, Condensed matter,atomic, molecular and chemical physics, biophysics, 17(10), 1995, pp. 1139-1148
Citations number
19
Categorie Soggetti
Physics
Journal title
ISSN journal
03926737
Volume
17
Issue
10
Year of publication
1995
Pages
1139 - 1148
Database
ISI
SICI code
0392-6737(1995)17:10<1139:NIAEIT>2.0.ZU;2-C
Abstract
The Li-like to He-like ion population ratio for calcium at the onset o
f solar flares is observed to be about 60% higher than in steady-state
ionization balance. The measurement of the duration of this initial p
eriod of transient ionization and of the population ratios of adjacent
ionization states allows an estimate of the electron density of the c
oronal plasma at flare onset. The density found in this study, within
1.10(9) and 7.10(9) cm(-3), is comparable with the density typical of
pre-flare active regions.