Physics – Plasma Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh33c..06o&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH33C-06
Physics
Plasma Physics
6984 Waves In Plasma (7867), 7509 Corona, 7800 Space Plasma Physics
Scientific paper
A new plasma wave mode has been proposed with quantized frequencies fDn = 3/π(fpefce)½ n½ , n = 1,2,... where fpe is the electron plasma frequency and fce is the electron gyrofrequency. These frequencies have been associated with a spectrum of emissions known as the Dn resonance stimulated by ionospheric topside sounders [Osherovich, 1987]. The foundations and observational support for this new electromagnetic mode have been summarized in the recent review by Osherovich et al. [2005] for three plasmas: the Earth's ionosphere (topside radio sounding from Alouette 2, ISIS 1 and ISIS 2 satellites), the Earth's magnetosphere (radio sounding from the IMAGE spacecraft) and in Jupiter's Io plasma torus (radio sounding from the Ulysses space probe). For these plasmas, the electron densities, magnetic fields and electron temperatures are quite different but in each of these plasmas there exists extended regions where the range of fpe/fce is roughly the same, namely 1≤ fpe/fce ≤ 8. From available observations of the solar corona and coronal loops, we conclude that the two-million degree corona is the fourth example of a magnetized plasma containing extended regions with fpe/fce in the same range. Therefore we predict the presence of Dn resonances with their distinctive √ n frequency spectrum, in the solar corona. References: Osherovich, V.A.,"Physical nature of diffuse plasma resonances in the ionosphere", J. Geophys. Res, 92, 316-320, 1987. Osherovich, V.A., R.F. Benson and J. Fainberg, "Electromagnetic bounded states and challenges of plasma spectroscopy", IEEE Transactions of Plasma Science, 33(2), 2005.
Benson Robert F.
Fainberg Joe
MacDowall R.
Osherovich Vladimir A.
Reinisch Bodo. W.
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