Physics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..167h&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 50, Feb. 1988, p. 167-172.
Physics
2
Geomagnetic Latitude, Gravity Waves, Ionospheric Electron Density, Traveling Ionospheric Disturbances, Radio Beacons, Satellite Transmission, Spread F
Scientific paper
Using satellite radio beacon transmissions, traveling ionospheric disturbnces have been observed in the electron content at L = 4. Waves are a common feature at this latitude, present for at least 98 percent of all daylight hours. The amplitude is usually 1-4 percent of the mean electron content, and periods range between 15 and 90 minutes. Simultaneous observation of two satellite beacons, giving an effective east-west separation of 350 km, indicated apparent east-to-west velocities of 200-700 m/s. A search was made for a likely source of the waves, using data from magnetometers and riometers, from incoherent scatter radar measurements of Joule heating, and from orbiting satellite measurements of electron influx, but no definite source could be established. It is also shown that traveling disturbances are closely related to occurrences of spread-F on ionograms at high latitudes.
Hargreaves John Keith
Hunsucker Robert D.
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