Occurrence Distributions of the Polarization Modes of the Auroral Kilometric Radiation

Details Occurrence Distributions of the Polarization Modes of the Auroral Kilometric Radiation Occurrence Distributions of the Polarization Modes of the Auroral Kilometric Radiation

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11a0770h&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11A-0770

Physics

2704 Auroral Phenomena (2407), 6939 Magnetospheric Physics, 6964 Radio Wave Propagation, 6984 Waves In Plasma

Scientific paper

Interball-2 has provided a good deal of polarization measurements of the auroral kilometric radiation (AKR), made in the nighside and dayside magnetosphere at invariant latitudes from 60 to 82 deg. We report a statistical study based on 41930 one minute averages of the measured degree of AKR circular polarization, from which the occurrences of the righthand extraordinary and lefthand ordinary wave modes have been inferred. Earlier findings that the R-X mode is dominant are quantitatively confirmed both in the nightside and dayside. It is shown that the L-O mode is met more frequently in the dayside hemisphere (27% of AKR) than in the evening - midnight sector (11%). For the "regular" polarization spectra, in which the R-O mode is observed in the upper part of the spectrum and the L-O mode in the lower one, the power ratios for these two modes (L-O)/(R-X) concentrate between about 0.1 to less than 0.01 times. This is roughly in agreement with earlier estimates (factor of 0.02). For "irregular" polarization spectra, in which the R-O mode and the L-O mode are scattered over the whole range of AKR dynamic spectrum, the L-O mode can reach intensities of the R-X mode (between 1 and 0.1). These unusually intensive and irregular L-O emissions were observed mostly in the dayside. Frequent occurrence of the relatively strong L-O emissions in this region seems to be connected with larger electron densities compared to the evening - midnight sector.

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