Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1197w&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, July 1991, p. 1197-1200.
Physics
85
Brunt-Vaisala Frequency, Gravity Waves, Midlatitude Atmosphere, Radar Measurement, Sporadic E Layer, Backscattering, Doppler Effect, Magnetic Fields, Radar Echoes, Very High Frequencies
Scientific paper
Recent E region VHF backscatter echoes observed by the MU radar at midlatitudes show quasi-periodic striations with a fairly constant range vs time tilt in a RTI display. These features are explained in terms of gravity waves with frequencies close to the Brunt-Vaisala frequency which modulate the shape of sporadic E layers. The conditions of instability, when the magnetic field has a significant dip angle, is revised. Conditions of local gradient drift instability are not sufficient, requiring consideration of the integrated properties of each magnetic field tube. Stratified sporadic E layers are stable using this new criteria, unless they are distorted to produce unstable integrated gradients. Gravity waves with phase fronts parallel to the magnetic dip angle are capable of producing such distortion, imposing its own temporal and spatial periodicity on the echoes.
Fukao Shoichiro
Woodman Ronald F.
Yamamoto Masayoshi
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