๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Ionization equilibrium in soft X-ray-emitting solar flares

โœ Scribed by K. J. H. Phillips; W. M. Neupert; R. J. Thomas

Publisher
Springer
Year
1974
Tongue
English
Weight
889 KB
Volume
36
Category
Article
ISSN
0038-0938

No coin nor oath required. For personal study only.

โœฆ Synopsis

Studies of the flare-produced line feature at 1.9 A due to highly ionized iron show that it is emitted in conditions closely approximating steady-state ionization equilibrium. Calculations of the line flux per unit emission measure from time-dependent and steady-state ionization equilibria are compared with observed values during four flares in particular. Only for electron densities Ne~ 10 TM cm -3 do the time-dependent equilibrium values give as good an approximation to the observed values as the steady-state equilibrium. This lower limit is compared with values of Are derived from analyses of the temperature decline in each of these events, and with estimates of Are given by other workers.

๐Ÿ“œ SIMILAR VOLUMES

Soft x-ray emitting regions in the solar
Soft x-ray emitting regions in the solar corona
โœ M. Landini; B. C. Monsignori Fossi ๐Ÿ“‚ Article ๐Ÿ“… 1971 ๐Ÿ› Springer ๐ŸŒ English โš– 485 KB

The soft X-ray emission of the solar corona is investigated by comparison of the signals of several broad band photometers carried on the Solrad 9 satellite, and sensitive to the region 0.5-20 A. Temperature from 1.5 โ€ข 106 to 25 โ€ข 106 K have been measured with 'emission measure' S N~2 dVranging betw

Solar soft X-ray flare spectra from OSO-
Solar soft X-ray flare spectra from OSO-4
โœ J. F. Meekins; G. A. Doschek; H. Friedman; T. A. Chubb; R. W. Kreplin ๐Ÿ“‚ Article ๐Ÿ“… 1970 ๐Ÿ› Springer ๐ŸŒ English โš– 726 KB
Heat flux saturation in hydrodynamic sof
Heat flux saturation in hydrodynamic soft X-ray solar flare plasmas
โœ I. J. D. Craig; J. W. Davys ๐Ÿ“‚ Article ๐Ÿ“… 1984 ๐Ÿ› Springer ๐ŸŒ English โš– 699 KB

The role of heat flux limitation in soft X-ray emitting solar flare plasmas is considered. Simple analytic arguments suggest that flux limitation is likely to be important during the explosive heating phase, even for relatively modest coronal energy fluxes (say < 109 erg cm-2 s -1). This conclusion

Non-thermal and non-equilibrium effects
Non-thermal and non-equilibrium effects in soft X-ray flare spectra
โœ A. H. Gabriel; E. Antonucci; L. Steenman-Clark ๐Ÿ“‚ Article ๐Ÿ“… 1983 ๐Ÿ› Springer ๐ŸŒ English โš– 330 KB

Processes leading to the excitation of soft X-ray line spectra are discussed in relation to their thermal or non-thermal nature. Through analysis of calcium spectra from the XRP experiment on SMM, it is shown that the ionization balance during the gradual phase of flares is effectively in the steady