Computer Science – Sound
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40..447j&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 4, April 1992, p. 447-455. Research supported by DOE.
Computer Science
Sound
15
Ionospheric Propagation, Plasma Waves, Traveling Ionospheric Disturbances, Very Large Array (Vla), Data Bases, F Region, Ionic Waves, Ionospheric Electron Density, Sound Waves
Scientific paper
Ionospheric waves were studied via their transient signatures in the line of sight total electron content (TEC) using the 1990 VLA observations. These observations confirmed that traveling ionospheric disturbances dominate at long periods of greater than 1000 s, their horizontal phase speeds are typically less than 0.2 km/s, and their azimuth distributions are quasi-isotropic. At short periods of greater than 300 s, the dominant waves are magnetic-eastward directed (MED) and have phase speeds in the range between 0.1-1 km/s. Data revealed that the MED disturbances are too fast to be F-region drifting irregularities but are too slow to be acoustic waves. The MED waves are found to cause very small rms TEC perturbations of less than or equal to 2 x 10 exp 13 per sq m and to be more active at night and are much more visible along South- rather than North-directed lines of sight.
Erickson William C.
Jacobson Abram R.
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