Abstract
Abstract. Near-simultaneous measurements of OI 557.7 nm, O2 (0, 1) Atmospheric Band and OH (6, 2) Meinel Band nightglow were carried out at Kolhapur (17° N), India during February–March 2007. Atmospheric temperatures around 87 and 94 km were derived from the knowledge of intensity measurements of spectral features OH (6, 2) Meinel Band and O2 Atmospheric Band, respectively. An account of the behaviour of derived temperatures has been presented. The nocturnal behaviour of OH and O2 temperatures is governed by the waves of tidal origin, whereas the signatures of planetary wave-like oscillations is noted in the night-to-night variation of two temperatures. This is probably the first report of planetary waves observed in nightglow temperatures from the Indian subcontinent.
Highlights
GeoscientificO3 + H → O2 + OH∗ Tathmeomspehseorsipchreergei–olnowbeetrwtheeenrm8o0sapnhdeMr1e0o(5MdkLemTl)cDhisareaancvtieemrilpzooerpdtambnyt ent unique thermal structure (negative temperature gradient in Geoscientific (1) Model DevelopmentDiscussions mesosphere, a pronounced minimum at mesopause and pos- O + O + M(O2 or N2) → O∗2 + M (2a) itive temperature gradient in thermosphere)H, cyomdprolexlocgheym-andHydrology and istry, Due radiative cooling, dynamics and to the photodissociative action of trthanesEipnoacrotrmtphirnogcSessyoselsasr.temEarth System ultraviolet radiationciniethnecesO∗2 + O → O2 + O(1S) Sciences(2b)Published by Copernicus Publications on behalf of the European Geosciences Union
The ground-based observations of the nightglow phenomenon constitute one of the most widely used remote sensing techniques to explore the mesopause region, and recently, much attention is being paid to the aeronomy of the upper middle atmosphere using simultaneous measurements of the different nightglow emissions depending upon atomic oxygen
Nocturnal behaviour of two temperatures is governed by a semidiurnal tide during February, whereas a mixture of diurnal and semidiurnal tide explains the observed temperature variations during March
Summary
GeoscientificO3 + H → O2 + OH∗ Tathmeomspehseorsipchreergei–olnowbeetrwtheeenrm8o0sapnhdeMr1e0o(5MdkLemTl)cDhisareaancvtieemrilpzooerpdtambnyt ent unique thermal structure (negative temperature gradient in Geoscientific (1) Model Development. The ground-based observations of the nightglow phenomenon constitute one of the most widely used remote sensing techniques to explore the mesopause region, and recently, much attention is being paid to the aeronomy of the upper middle atmosphere using simultaneous measurements of the different nightglow emissions depending upon atomic oxygen (mainly OH Meinel Band, O2 Atmospheric Band and the OI 557.7 nm emission as mentioned). Such studies provide valuable information regarding the chemistry and transport processes, dynamics and thermal structure of the MLT region. The nocturnal behaviour of the intensity of OI 557.7 nm emission, noted in the present study, is quite similar to that reported earlier from the current observation site by Parihar et al (2011), and a brief report of observations of OI 557.7 nm emission during February– March 2007 has been presented here
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