Thule Riometer Observations of Polar Cap Absorption Events (1962-1972)

Polar Cap Absorption (PCA) events have been observed at Thule, Greenland, using a ground-based riometer for the past decade. The riometer was operated at a fixed frequency of 30 MHz, and used a two-element Yagi antenna directed toward the zenith. This report provides information for operational syst...

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Bibliographic Details
Main Author: Cormier, Raymond J
Other Authors: AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA
Format: Text
Language:English
Published: 1973
Subjects:
Atmospheric Physics
*IONOSPHERIC DISTURBANCES
GREENLAND
PROTONS
RIOMETERS
SCIENTIFIC SATELLITES
SOLAR RADIATION
*POLAR CAP ABSORPTION
SOLAR PROTONS
THULE(GREENLAND)
Greenland
Thule
Online Access:http://www.dtic.mil/docs/citations/AD0762279
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0762279
Description
Summary:Polar Cap Absorption (PCA) events have been observed at Thule, Greenland, using a ground-based riometer for the past decade. The riometer was operated at a fixed frequency of 30 MHz, and used a two-element Yagi antenna directed toward the zenith. This report provides information for operational systems personnel and systems designers concerning the mean behavior of PCAs and other aspects of the phenomenon; for example, the extreme cases in duration and magnitude. In addition, included as an appendix are plots of dB absorption and proton flux (obtained from satellites) versus time for each event. The total number of events is 29.

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