Computer Science – Sound
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1431p&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 8, p. 1431-1434
Computer Science
Sound
11
Atmospheric Composition And Structure: Middle Atmosphere-Energy Deposition, Ionosphere: Electric Fields, Ionosphere: Ionospheric Irregularities
Scientific paper
Electric field wave measurements gathered on a sounding rocket flown in the presence of polar mesospheric summer echoes reveal a distinct layer of irregularities between 83-86 km with broadband amplitudes of >10 mV/m rms. The waves are characterized by bursty, spiky waveforms with lower frequencies (~10 Hz) dominant in the upper portion of the layer near 85 km and broader band emissions, extending to higher frequencies (~1000 Hz) dominant in the lower portion of the layer near 83.5 km. The lower altitudes correspond to a region of weak optical emissions associated with a noctilucent cloud. The waves appear in and around regions where charged/neutral aerosols (1-10 nm) and large electron density depletions were observed. The irregularities likely result from a variety of processes including space charge inhomogeneities, mixed neutral and plasma motions, and complex effects associated with charged aerosols of varying sizes.
Bounds S.
Croskey C.
Freudenreich Henry
Goldberg R.
Gumbel Jörg
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