Neeta H Majmudar
Articles written in Journal of Earth System Science
Volume 89 Issue 1 March 1980 pp 109-114
Measurements of intensities at two fixed wavelengths in the OH (7-2) band were carried out at Mt Abu (24.6° N, 76.7° E) from 1973–76 to estimate neutral temperature in the region of 80–90 km altitude. It was observed that on some nights the temperature in this region shows periodic oscillations throughout the night. It was found from statistical analysis that the periods of these fluctuations are comparable to the theoretically predicted periods of internal gravity waves.
If the periodic temperature variations observed in this region are attributed to the influence of gravity waves, according to the Hines theory only the magnitude of the horizontal component of wave-induced wind velocity can be computed. Using the measured relative temperature fluctuations it is found that the magnitude is 15–30 m/sec.
Volume 92 Issue 3 November 1983 pp 217-222
Diurnal variations of occurrence hours and the period of Pi2 pulsations at Choutuppal (India) for nearly half a solar cycle are presented. Maximum occurrence is noticed to be around local midnight in all the seasons. Shorter periods are observed in the late afternoon hours in E-and J-seasons. Lunar influence on the occurrence of Pi2 pulsations at this station is inferred with the occurrence due to this influence peaking in the vicinity of the lunar phase