The plasma line revisited as an aeronomical diagnostic: Suprathermal electrons, solar EUV, electron-gas thermal balance
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چکیده
منابع مشابه
Dispersion relation for electron waves propagating in an isotropic plasma containing Maxwellian and suprathermal electrons
The paper discusses the dispersion relation for longitudinal electron waves propagating in a collisionless, homogeneous isotropic plasma, which contains both Maxwellian and suprathermal electrons. I t is found that the dispersion curve, known to have two separate branches for zero suprathermal energy spread, depends sensitively on this quantity. As the energy half-width of the suprathermal popu...
متن کاملEect of suprathermal electrons on the intensity and Doppler frequency of electron plasma lines
In an incoherent scattering radar experiment, the spectral measurement of the so-called upand downshifted electron plasma lines provides information about their intensity and their Doppler frequency. These two spectral lines correspond, in the backscatter geometry, to two Langmuir waves travelling towards and away from the radar. In the daytime ionosphere, the presence of a small percentage of ...
متن کاملMulti-ion plasma expansion in the presence of suprathermal electrons
The self similar expansion of a two-ion plasma is investigated via a multi-fluid model. Our aim is to elucidate the effect of secondary ions on the plasma expansion front, in combination with energetic (suprathermal) electrons in the background. Considering an analytically tractable situation (namely, assuming secondary ions to represent a minority population), and adopting a kappa-type distrib...
متن کاملDiagnostic techniques for measuring suprathermal electron dynamics in plasmas (invited).
Plasmas, both in the laboratory and in space, are often not in thermodynamic equilibrium, and the plasma electron distribution function is accordingly non-Maxwellian. Suprathermal electron tails can be generated by external drives, such as rf waves and electric fields, or internal ones, such as instabilities and magnetic reconnection. The variety and importance of the phenomena in which suprath...
متن کاملLimitations on suprathermal tails of electrons in the lower solar corona
Measurements of the charge states of solar wind ions by the SWICS instrument on Ulysses are used to place limits on the extent to which the velocity distribution of electrons in the lower solar corona deviates from a Maxwellian distribution by having a suprathermal tail. It is found that the data are consistent with a suprathermal tail which is not large, and which has a minor influence on the ...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 1977
ISSN: 0094-8276
DOI: 10.1029/gl004i012p00565