Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11a0769s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM11A-0769
Physics
2403 Active Experiments, 2407 Auroral Ionosphere (2704), 2471 Plasma Waves And Instabilities, 2487 Wave Propagation (6934), 2772 Plasma Waves And Instabilities
Scientific paper
We report on observations and analysis of diffuse whistler mode echoes received by RPI on IMAGE. The diffuse whistler echoes have frequencies below local electron cyclotron frequency and are characterized by an apparent spread in their time delays. The echoes are in the frequency range ~10-300 kHz and show well defined lower and upper cutoff frequencies. Out of 35 cases examined, diffuse echoes were observed on 13 cases, with 9 of them identified during the period when IMAGE was at low altitude (<= 1500 - 5000 km) near its perigee in the southern hemisphere, and four when IMAGE was at relatively high altitude ( ~ 10,000 km) and at geomagnetic latitudes ranging between 40-50o. In several instances, the diffuse echoes were accompanied by z-mode radiation and in some cases by free space mode echoes. We propose that these echoes are the result of scattering of RPI signals by meter scale irregularities, commonly found in the low altitude magnetosphere. A linear mode conversion mechanism, first proposed to explain spectral broadening of ground transmitter signals observed on satellites, can account for many observed features of these echoes including the diffuse nature and cutoff frequencies.
Bell Timothy F.
Carpenter Donald L.
Harikumar J.
Inan Umran S.
Reinisch Bodo. W.
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