Longitudinal variation of mid-latitude hiss from six long duration balloon flights

Details Longitudinal variation of mid-latitude hiss from six long duration balloon flights Longitudinal variation of mid-latitude hiss from six long duration balloon flights

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9510599d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, July 1, 1990, p. 10599-10607. Research supported by the University of

Physics

2

Atmospheric Attenuation, Balloon Flight, Electron Cyclotron Heating, Trapped Particles, Whistlers, Hiss, Pitch (Inclination), Radiation Belts, Very Low Frequencies

Scientific paper

The longitudinal variation of midlatitude hiss as measured on six balloons at latitudes of 35-55 deg S, shows a significant minimum at 70-80 deg E, about 1000 km east of the geomagnetic conjugate of the Soviet transmitter UMS (17.1 kHz). It is suggested that the well documented pitch-angle diffusion induced by the UMS signal removes the ability of the trapped electrons to maintain the amplification of the hiss to at least the reflection and reducting losses (about 20 dB) at the ends of the echoing ducted path. The eastward shift of the minimum from the conjugate of UMS is primarily caused by the time taken by the eastward-drifting electrons to recover this ability, though the effect is enhanced by the east-west asymmetry in the propagation of hiss under the ionosphere.

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