Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa33a..02s&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SA33A-02
Other
0310 Airglow And Aurora, 3332 Mesospheric Dynamics
Scientific paper
In order to investigate the relation between the sodium airglow emission and sodium atoms, a narrow-band and narrow field-of-view sodium airglow photometer was operated in campaign modes from Gadanki (13.5° N, 79.2° E) in conjunction with sodium lidar during March, 2007 and 2008. The airglow observations yielded the temporal variation of altitude-integrated sodium airglow intensity whereas sodium lidar observations provided the altitudinal profile of neutral sodium atoms from 80 to 105 km. These observations reveal the dominance of 30-60 minutes periodicity in sodium airglow variation. Interestingly, sodium airglow on 18-19 March, 2007 shows an unusual variation compared to the other nights of observations. The power spectrum analysis indicates that the periods are different from other nights over Gadanki. Both airglow intensity variation and map of Height-Time-Concentration (HTC) of neutral sodium atoms obtained from sodium lidar observation reveal oscillatory patterns. The periods from the power spectra of sodium atoms variation at 93 and 94 km match well with the periods obtained from sodium airglow variation. Correlation analysis is carried out between the sodium airglow variation and sodium atoms variation at each altitude which also reveals the same peak altitude. The volume emission rate profile of sodium airglow is derived using mesospheric ozone retrieved by SABER instrument onboard TIMED satellite (measured at 01:30 IST; IST=UT+5.5 hrs) nearly over Gadanki. Both the ozone and sodium concentration profiles at that time show a peak at around 94 km. The result obtained from this investigation will be discussed.
Chakrabarty Deepto
Narayanan Rajamani
Sarkhel S.
Sekar R.
Sridharan Sriram
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