Effect of Solar Eclipse on Middle Atmospheric Temperature over Bahir Dar Region using SABER Satellite Data

Megertu, Abera

dc.contributor.author	Megertu, Abera
dc.date.accessioned	2019-03-04T04:16:54Z
dc.date.available	2019-03-04T04:16:54Z
dc.date.issued	2019-03-04
dc.identifier.uri	http://hdl.handle.net/123456789/9285
dc.description.abstract	Solar eclipse provides a rare opportunity to study the interaction between solar irradiances with the terrestrial atmosphere. There are different types of solar eclipses such as, total solar eclipse, partial solar eclipse, annular solar eclipse and hybrid solar eclipse. Solar eclipse occurs when the Moon passes partially or fully in front of the Sun, which casts a shadow over a certain area of the Earth and the formation of gravity wave structure induced by cooling of the atmosphere. The objective of this study is to investigate the changes in the altitudinal distribution of temperature, ozone mixing ratio, hydroxyl emission volume and chemical heating rate on the middle atmosphere region (30-80 km) during the hybrid solar eclipse occurred on 03 November 2013 using the SABER (Sounding of the Atmosphere using Broad Emission Radiometry) instrument on board the TIMED (Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics) satellite. Although various studies have been carried out on the effects of solar eclipse on lower atmosphere at different latitudes, yet there are limited studies on middle atmosphere at tropic latitude. The present work is therefore the first of its kind in African sector particularly in using SABER satellite data. The results of this study reveals that a cooling of the order of -5 to -10K in the mesospheric region during eclipse day. The supersonic motion of the Moon’s shadow (cooling spot) is believed to be the reason for the raised gravity wave activity induce solar eclipse. The brunt vaisala frequency square (N2) indicates a convective instability around 75 km and consequently breaking of gravity waves leads to the disturbance in the concentration chemical constituents.	en_US
dc.language.iso	en_US	en_US
dc.subject	Physics	en_US
dc.title	Effect of Solar Eclipse on Middle Atmospheric Temperature over Bahir Dar Region using SABER Satellite Data	en_US
dc.type	Thesis	en_US