Current Science

The PDF file you selected should load here if your Web browser has a PDF reader plug-in installed (for example, a recent version of Adobe Acrobat Reader).

If you would like more information about how to print, save, and work with PDFs, Highwire Press provides a helpful Frequently Asked Questions about PDFs.

Alternatively, you can download the PDF file directly to your computer, from where it can be opened using a PDF reader. To download the PDF, click the Download link above.

Fullscreen Fullscreen Off


Simultaneous mesospheric OH and O2 temperature estimates are used in the present study to characterize the wave perturbations over Gadanki (13.5°N, 79.2°E), a low-latitude station in India. The 65° zenith angle scanning measurements show large variations from one direction to another. The zonal and vertical wavelengths of the observed wave perturbation are found to vary from 740 to 4500 km and 26 to 38 km. The temperature gradient between OH and O2 layers has been calculated, which shows significant short-period variability. The temperature gradient measurements show large changes from one direction to another. The occurrence of such large temperature gradients within 400 km suggests thermal state of the upper mesosphere to be highly dynamic, which can severely impact the upward propagation of shortperiod gravity waves.

Keywords

Airglow Measurements, Mesosphere, Temperature, Thermal Gradient, Wave Perturbations.
User
Notifications
Font Size