Mesospheric gravity waves over a tropical convective region observed by OH airglow imaging in Indonesia

Details Mesospheric gravity waves over a tropical convective region observed by OH airglow imaging in Indonesia Mesospheric gravity waves over a tropical convective region observed by OH airglow imaging in Indonesia

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30qasc4n&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 17, pp. ASC 4-1, CiteID 1882, DOI 10.1029/2003GL017619

Mathematics

Logic

21

Atmospheric Composition And Structure: Airglow And Aurora, Meteorology And Atmospheric Dynamics: Waves And Tides, Meteorology And Atmospheric Dynamics: Mesospheric Dynamics, Meteorology And Atmospheric Dynamics: Tropical Meteorology

Scientific paper

From OH airglow imaging observation carried out over one year in Indonesia, 74 events of gravity waves in the MLT (Mesosphere and Lower Thermosphere) region were extracted. Observed period, horizontal wavelength and observed horizontal phase speeds of gravity waves were typically 5-13 min, 13-45 km and 37-75 m/s, respectively. Propagation directions were mostly southward except for the period between December and February, when eastward propagation was preferential. Spatial distributions of tropospheric clouds, estimated with GMS (Geostationary Meteorological Satellite) were consistent with the propagation direction of gravity waves, i.e., these clouds mainly existed in the opposite direction to the propagation direction of waves. This suggests that horizontal propagation characteristics of the short period gravity waves in the low latitude MLT region are mainly affected by the distribution of the wave sources in the troposphere, and the effect of the background mean wind in the middle atmosphere is smaller, as it is weaker (~20 m/s) in the equatorial region.

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