On the presence of high-frequency turbulent electric fields in the August 7, 1960 flare

Details On the presence of high-frequency turbulent electric fields in the August 7, 1960 flare On the presence of high-frequency turbulent electric fields in the August 7, 1960 flare

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990baicz..41...88f&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 41, no. 2, March 1990, p. 88-96.

Astronomy and Astrophysics

Astronomy

1

Balmer Series, Electric Fields, Hydrogen Plasma, Plasma Turbulence, Solar Flares, Electron Density (Concentration), High Frequencies, Solar Atmosphere, Solar Spectra

Scientific paper

According to Oks (1978), the wings of some hydrogen Balmer lines observed in the spectrum of the moustache-like flare of August 7, 1960 do exhibit theoretically predicted dips, which should indicate the presence of Langmuir turbulence. However, these features are rather subtle and thus several difficulties arise if one tries to identify them in the noisy spectra with typically many blends. Moreover, the Balmer profiles used for Oks' analysis were already 'filtered' in a special manner, which strongly affects the results. In view of these problems, consideration is given to whether these dips in this particular flare were real, starting with newly obtained microphotometric records. Using the same lines as Oks (i.e., H7, H8, H11-13), together with H14, none of the expected dips in the line wings were identified. All observational aspects of this analysis are discussed in detail, and new special observations are proposed. The role of electron density variations within the flare volume is also briefly discussed.

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