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Highly structured tropical airglow and TEC signatures during strong geomagnetic activity
Author(s) -
Kelley M. C.,
Garcia F.,
Makela J.,
Fan T.,
Mak E.,
Sia C.,
Alcocer D.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900598
Subject(s) - airglow , ionosphere , earth's magnetic field , tec , geology , space weather , sky , latitude , atmospheric sciences , satellite , observatory , night sky , geophysics , geodesy , remote sensing , meteorology , physics , astronomy , quantum mechanics , magnetic field
A remarkable set of all‐sky images using the 630 nm airglow emission has been taken over the Arecibo Observatory in Puerto Rico. Wave‐like structures at a height of about 250 km are commonly found to travel in the southwest direction at speeds ranging from 20–120 m/s. Most surprising is that geomagnetic activity seems to greatly amplify them, forming very intricate patterns of light and dark. Simultaneous observations using GPS satellite transmissions on one night reveal that dark regions are severely plasma depleted while bright regions have nighttime content as large as the full noontime ionosphere. This unexpected geomagnetic effect at mid‐latitudes has implications for trans‐ionospheric radiowave propagation and Space Weather.