Computer Science – Sound
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.1683w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, March 1, 1984, p. 1683-1694.
Computer Science
Sound
133
Atmospheric Ionization, F Region, Ionospheric Sounding, Night Sky, Polar Caps, All Sky Photography, Arctic Regions, Ionosondes, Optical Measurement, Plasma Diagnostics, Radio Probing, Scintillation
Scientific paper
Ground-based optical and digital ionosonde measurements were conducted at Thule, Greenland to measure ionospheric structure and dynamics in the nighttime polar cap F layer. These observations showed the existence of large-scale (800-1000 km) plasma patches drifting in the antisunward direction during a moderately disturbed (Kp greater than or equal to 4) period. Simultaneous Dynamics Explorer (DE-B) low-altitude plasma instrument (LAPI) measurements show that these patches with peak densities of about 10 to the 6th el per cu cm are not locally produced by structured particle precipitation. The LAPI measurements show a uniform precipitation of polar rain electrons over the polar cap. The combined measurements provide a comprehensive description of patch structure and dynamics. They are produced near or equatorward of the dayside auroral zone and convect across the polar cap in the antisunward direction. Gradients within the large scale, drifting patches are subject to structuring by convective instabilities. UHF scintillation and spaced receiver measurements are used to map the resulting irregularity distribution within the patches.
Büchau Jurgen
David Winningham J.
Livingston R. C.
Moore James G.
Reinisch Bodo. W.
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