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Title: Enhanced gravity wave activity over the equatorial MLT region during counter electrojet events
Authors: Vineeth, C
Pant, T K
Hossain, M M
Keywords: Equatorial counter electrojet (CEJ) event
Gravity wave activity
Hydroxyl airglow emission
Mesopause energetics
Issue Date: Apr-2012
Publisher: NISCAIR-CSIR, India
Abstract: This paper reports the evidence for an enhanced gravity wave activity of 1-2 hour periodicity in the equatorial mesopause temperature during the counter electrojet (CEJ) events. The analysis based on the data from a unique dayglow photometer and Proton Precession Magnetometer over a dip equatorial station Trivandrum (8.5°N, 77°E, dip latitude 0.5°N) clearly indicates that in general, the wave activity is high during CEJ events compared to a normal day. It is very interesting to note that the wave activity at mesopause region fades out during the period of the occurrence of CEJ when the mesospheric zonal wind shows a reversal from west to east. This indicates a possible upward penetration of the gravity waves from mesosphere to lower thermosphere during such events, thereby, reversing the vertical polarization field and hence the generation of CEJ. This study presents first direct evidence for such an enhancement in the wave activity in the upper mesospheric region during CEJ events, supporting the gravity hypothesis of Raghavarao & Anandarao [Raghvarao R & Anandarao B G, Vertical winds as a plausible cause for equatorial counter electrojet, Geophys Res Lett (USA), 7 (1980) pp 357–360].
Description: 258-263
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.41(2) [April 2012]

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