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F-layer ionization patches in the polar cap

Author: E J WeberJ BuchauJ G MooreJ R SharberR C LivingstonAll authors
Publisher: Hanscom AFB, Massachusetts : Air Force Geophysics Laboratory, Air Force Systems Command, United States Air Force, 1983.
Series: AFGL-TR, 83-276.; Environmental research papers (Hanscom AFB, Mass.), no. 859.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
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 anti-sunward direction during a moderately disturbed (Kp> 4) period. Simultaneous Dynamics Explorer (DE-2) Low Altitude Plasma Instrument  Read more...
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Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: E J Weber; J Buchau; J G Moore; J R Sharber; R C Livingston; J David Winningham; B W Reinisch; U.S. Air Force Geophysics Laboratory. Space Physics Division.
OCLC Number: 11139852
Notes: Cover title.
Distributed to depository libraries in microfiche.
"5 October 1983."
Space Physics Division Project 4643.
Description: 34 pages : illustrations ; 28 cm.
Series Title: AFGL-TR, 83-276.; Environmental research papers (Hanscom AFB, Mass.), no. 859.
Other Titles: Technical Report Archive & Image Library (TRAIL)
Responsibility: E.J. Weber, J. Buchau, J. G. Moore, J. R. Sharber, R. C. Livingston, J. D. Winningham, B. W. Reinisch.

Abstract:

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 anti-sunward direction during a moderately disturbed (Kp> 4) period. Simultaneous Dynamics Explorer (DE-2) Low Altitude Plasma Instrument (LAPI) measurements show that these patches, with peak densities of approx. = 1000000 el 1/cm 3, 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 anti-sunward direction. As gradients within the large scale, drifting patches are subject to structuring by convective instabilities. The resulting irregularity distribution within the patches is mapped using uhf scintillation and spaced-receiver measurements.

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