Sudden commencement absorption events at the south pole and their relation to the latitude of the lower cleft boundary

Journal Article · Mon May 01 04:00:00 EDT 1978 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA083iA05p02205· OSTI ID:7087902

Brown, R R

From 7 years (1966--1973) of riometer data from the south pole (74.2/sup 0/ invariant latitude), 43 sudden commencements of magnetic storms were examined for sudden commencement absorption (sca) events and the possible influence of the lower cleft boundary latitude on electron precipitation at that site. For 17 of the events, interplanetary magnetic field (IMF) data are available to predict the position of the lower cleft boundary. Three of the sea events at the south pole occurred during IMF conditions when the predicted cleft bounday, including the effect of magnetic activity (AE), was equatorward of that site by 2/sup 0/-4/sup 0/. The observation of sudden commencement electron precipitation at the south pole at these times indicates that the cleft region involves closed field lines.

• Research Organization: Department of Physics, University of California, Berkeley, California 94720
• OSTI ID: 7087902
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 83:A5; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTARCTIC REGIONS
ANTARCTICA
CHARGED-PARTICLE PRECIPITATION
DISTURBANCES
ELECTRON PRECIPITATION
INTERPLANETARY MAGNETIC FIELDS
IONOSPHERIC STORMS
MAGNETIC BAYS
MAGNETIC FIELDS
MAGNETIC STORMS
POLAR REGIONS
SUDDEN IONOSPHERIC DISTURBANCE