Physics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30vssc5s&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 22, pp. SSC 5-1, CiteID 2149, DOI 10.1029/2003GL017544
Physics
5
Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Dynamics, Ionosphere: Midlatitude Ionosphere, Ionosphere: Plasma Waves And Instabilities, Ionosphere: Wave Propagation (6934)
Scientific paper
High-resolution observations of the daytime quasi-periodic (QP) structures of the lower E region irregularities made using the Gadanki VHF radar are presented. The structures are found to display striations with negative altitude rates of ~10 m s-1 and periods of 1-3 minutes. More importantly, these structures are found to be associated with a descending irregularity layer having descent rate of ~0.3 m s-1. The characteristics of these structures although resemble closely to that of nighttime low altitude structures observed earlier at Gadanki as well as at mid-latitudes, the periodicities observed during daytime are found to be higher than that observed during nighttime. The Doppler velocities are mostly in the range -20-10 m s-1 and exhibit remarkable shear corresponding to the echoes of larger periodicities. The echoes being mostly confined to the collision dominated lower E region, it is possible to derive meridional neutral wind and the derived wind shows remarkable shear. It is proposed that the Kelvin-Helmholtz instability is the most likely mechanism responsible for the observed structures presented in this paper.
Patra Amit Kumar
Rao Balarama P.
Sivakumar Venkataraman
Sripathi S.
No associations
LandOfFree
Shear instability as a source of the daytime quasi-periodic radar echoes observed by the Gadanki VHF radar does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Shear instability as a source of the daytime quasi-periodic radar echoes observed by the Gadanki VHF radar, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shear instability as a source of the daytime quasi-periodic radar echoes observed by the Gadanki VHF radar will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1089967