Transient plasmas in the solar transition zone

Details Transient plasmas in the solar transition zone Transient plasmas in the solar transition zone

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..333d&link_type=abstract

Astrophysical Journal, Part 1, vol. 249, Oct. 1, 1981, p. 333-339.

Astronomy and Astrophysics

Astrophysics

27

Magnetohydrodynamic Stability, Plasma Radiation, Plasma Spectra, Solar Corona, Solar Spectra, Ultraviolet Spectra, Carbon, Emission Spectra, Radiant Cooling, Solar Atmosphere, Thermal Instability, Variability

Scientific paper

Observations of C IV emission from the transition zone of the quiet sun have been obtained with high spatial (1 arcsec), spectral (0.1 A), and temporal (20 s) resolution by a high resolution telescope and spectrograph. Over spatial scales of several arc seconds, the C IV profile often exhibits dramatic changes in either the red or blue wing or in the overall profile at the 20 s temporal resolution of the observations. It is suggested that some of the rapidly varying emission may be produced by radiatively cooling plasmas that result from the thermal instability of coronal plasma. It is shown that such plasmas, which are in transient ionization, can emit 35 s pulses of C IV emission for reasonable pressure values. It is also shown that, because of the limited ability of coronal plasma to maintain ionization equilibrium, the criteria for the thermal radiative instability must be evaluated in a manner different from the standard treatment in the case of rapid perturbations or growth times. From a consideration of length scales it is determined that these instabilities are most likely to occur in the upper transition zone.

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