Auroral riometer absorptions and the F-region disturbances observed over a wide range of latitudes

Hajkowicz L.A. (1983) Auroral riometer absorptions and the F-region disturbances observed over a wide range of latitudes. Journal of Atmospheric and Terrestrial Physics, 45 2-3: 175-179. doi:10.1016/S0021-9169(83)80022-1


Author Hajkowicz L.A.
Title Auroral riometer absorptions and the F-region disturbances observed over a wide range of latitudes
Journal name Journal of Atmospheric and Terrestrial Physics
ISSN 0021-9169
Publication date 1983-01-01
Sub-type Article (original research)
DOI 10.1016/S0021-9169(83)80022-1
Volume 45
Issue 2-3
Start page 175
End page 179
Total pages 5
Subject 1902 Film, Television and Digital Media
1908 Geophysics
Abstract Standard riometer data from a southern auroral station were compared with ionograms obtained at five stations positioned from sub-auroral to equatorial latitudes. The rapid onset in riometer absorption, during intense substorm activities in an equinoctial period, was associated with a sequential propagation of ionospheric disturbances deduced from the F-region parameters h′F and range spread-F. The time shift between absorption maxima and extrapolated commencement times of the disturbances was consistent with the presence of large-scale travelling ionospheric disturbances (TIDs), propagating equatorwards with velocities lying typically in the range 600-900 m s-1, and with a median velocity of 720 m s-1. It is suggested that the onset of TIDs is associated with high-energy particle precipitation, manifested by the occurrence of auroral absorption events. Similarity of absorption increases at the southern and northern conjugate points, found from a previous riometer study, would indicate that large-scale TIDs are simultaneously generated in both hemispheres.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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