Long duration lion roars associated with quasi-perpendicular bow shocks

Details Long duration lion roars associated with quasi-perpendicular bow shocks Long duration lion roars associated with quasi-perpendicular bow shocks

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90..241r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Jan. 1, 1985, p. 241-248.

Physics

9

Bow Waves, Electromagnetic Noise, Magnetospheric Instability, Plasma Waves, Space Plasmas, Gyrofrequency, Magnetosheath, Polarization (Waves), Radio Spectra, Solar Wind, Very Low Frequencies

Scientific paper

It is pointed out that lion roars are sporadic electromagnetic emissions occurring in the earth's magnetosheath. The emissions are generally narrow band in frequency, in the range from 10 to 300 Hz, and resemble a lion's roar when the waveform is heard with an acoustic amplifier. The first observations of magnetosheath lion roars were reported by Smith et al. (1969). They concluded that the emissions were most likely to be whistler mode signals which were amplified by wave-particle interactions, such as Landau or cyclotron resonance. The present investigation provides specific examples and a statistical analysis of lion roars detected with the IMP 6 satellite over a period of one year. Attention is given to long duration lion roar (LDLR) plasma wave spectra, the characteristic frequency of LDLR, LDLR wave polarization, and the mean LDLR spectrum.

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