Polar Riometer Observations.

Qualitative descriptions of the morphology of Polar Cap Absorption (PCA) events are given, using data from the following riometer stations: Thule and Godhavn, Greenland; Churchill Range, Manitoba, Canada; and Reykjavik (Leirvogur), Iceland. The dependence of commencement time on solar zenith angle a...

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Bibliographic Details
Main Author: Cormier,Raymond J.
Other Authors: AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
Format: Text
Language:English
Published: 1970
Subjects:
Atmospheric Physics
Test Facilities
Equipment and Methods
(*ATMOSPHERIC SOUNDING
*RIOMETERS)
(*IONOSPHERIC DISTURBANCES
POLAR REGIONS)
SOLAR FLARES
AURORAE
EXTRATERRESTRIAL RADIO WAVES
ABSORPTION
PROTONS
*POLAR CAP ABSORPTION
Canada
Greenland
Churchill
Godhavn
Iceland
Thule
Online Access:http://www.dtic.mil/docs/citations/AD0721183
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0721183
Description
Summary:Qualitative descriptions of the morphology of Polar Cap Absorption (PCA) events are given, using data from the following riometer stations: Thule and Godhavn, Greenland; Churchill Range, Manitoba, Canada; and Reykjavik (Leirvogur), Iceland. The dependence of commencement time on solar zenith angle and subsequent daily variations in absorption following the initial day are described. The morphology of PCA events is very important for forecasting the behavior of ionospheric absorption during a PCA event. It is shown that besides information concerning the energy spectrum of the proton flux, the season and time of day must also be considered for forecasting the expected absorption. (Author)

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