an investigation of long-distance propagation of gravity waves under cawses india phase ii programme
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2015
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Abstract
Coordinated measurements of airglow features from the mesosphere–lower
thermosphere (MLT) region were performed at Allahabad (25.5° N, 81.9° E)
and Gadanki (13.5° N, 79.2° E), India to study the propagation of gravity waves in
13–27° N latitude range during the period June 2009 to May 2010 under
CAWSES (Climate And Weather of Sun Earth System) India
Phase II Programme. At Allahabad, imaging observations of OH broadband
emissions and OI 557.7 nm emission were made using an all-sky imager, while
at Gadanki photometric measurements of OH (6, 2) Meinel band and O2
(0, 1) Atmospheric band emissions were carried out. On many occasions, the
nightly observations reveal the presence of similar waves at both locations.
Typically, the period of observed similar waves lay in the 2.2–4.5 h range,
had large phase speeds (~ 77–331 m s−1) and large wavelengths
(~ 1194–2746 km). The images of outgoing long-wave radiation
activity of the National Oceanic and Atmospheric Administration (NOAA) and the
high-resolution infrared images of KALPANA-1 satellite suggest that such
waves possibly originated from some nearby convective sources. An analysis
of their propagation characteristics in conjunction with SABER/TIMED
temperature profiles and Horizontal Wind Model (HWM 2007) wind estimates
suggest that the waves propagated over long distances (~ 1200–2000 km) in atmospheric ducts.
| Reference Key |
parihar2015annalesan
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|---|---|
| Authors | ;N. Parihar;A. Taori |
| Journal | journal of food measurement and characterization |
| Year | 2015 |
| DOI |
10.5194/angeo-33-547-2015
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| URL | |
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