Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements

Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements

Plasma irregularity structures associated with an Equatorial Spread-F (ESF) event were recorded by the Indian VHF Radar on 26–27 April 2006 near midnight hours. The plasma structures were found to be isolated without having bottomside structure. They moved predominantly downward and th...

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Main Authors: R. Sekar, D. Chakrabarty, S. Sarkhel, A. K. Patra, C. V. Devasia, M. C. Kelley
Format: Article
Language:English
Published: Copernicus Publications 2007-11-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/25/2099/2007/angeo-25-2099-2007.pdf
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spelling doaj-7d4696cabbc149a49a3456ae2f14bb7b2020-11-24T22:54:26ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762007-11-01252099210210.5194/angeo-25-2099-2007Identification of active fossil bubbles based on coordinated VHF radar and airglow measurementsR. Sekar0D. Chakrabarty1S. Sarkhel2A. K. Patra3C. V. Devasia4M. C. Kelley5Physical Research Laboratory, Ahmedabad, IndiaPhysical Research Laboratory, Ahmedabad, IndiaPhysical Research Laboratory, Ahmedabad, IndiaNational Atmospheric Research Laboratory, Gadanki, IndiaSpace Physics Laboratory, Vikram Sarabhai Space Center, Thiruvananthapuram, IndiaSchool of Electrical and Computer Engineering, Cornell University, Ithaca, NY, USAPlasma irregularity structures associated with an Equatorial Spread-F (ESF) event were recorded by the Indian VHF Radar on 26–27 April 2006 near midnight hours. The plasma structures were found to be isolated without having bottomside structure. They moved predominantly downward and the structures were found to be less turbulent than their post-sunset counterparts. However, the structures were characterized by meter-scale size irregularities. These structures are identified for the first time as plasma depletion structures using simultaneous, collocated measurements of OI 630.0 nm airglow intensity variations. The variation of the base height of ionospheric F layer over dip equator is also presented to buttress the result. Further, these plasma structures are shown to be "active fossil bubbles".https://www.ann-geophys.net/25/2099/2007/angeo-25-2099-2007.pdf
collection DOAJ
language English
format Article
sources DOAJ
author R. Sekar
D. Chakrabarty
S. Sarkhel
A. K. Patra
C. V. Devasia
M. C. Kelley
spellingShingle R. Sekar
D. Chakrabarty
S. Sarkhel
A. K. Patra
C. V. Devasia
M. C. Kelley
Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements
Annales Geophysicae
author_facet R. Sekar
D. Chakrabarty
S. Sarkhel
A. K. Patra
C. V. Devasia
M. C. Kelley
author_sort R. Sekar
title Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements
title_short Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements
title_full Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements
title_fullStr Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements
title_full_unstemmed Identification of active fossil bubbles based on coordinated VHF radar and airglow measurements
title_sort identification of active fossil bubbles based on coordinated vhf radar and airglow measurements
publisher Copernicus Publications
series Annales Geophysicae
issn 0992-7689
1432-0576
publishDate 2007-11-01
description Plasma irregularity structures associated with an Equatorial Spread-F (ESF) event were recorded by the Indian VHF Radar on 26–27 April 2006 near midnight hours. The plasma structures were found to be isolated without having bottomside structure. They moved predominantly downward and the structures were found to be less turbulent than their post-sunset counterparts. However, the structures were characterized by meter-scale size irregularities. These structures are identified for the first time as plasma depletion structures using simultaneous, collocated measurements of OI 630.0 nm airglow intensity variations. The variation of the base height of ionospheric F layer over dip equator is also presented to buttress the result. Further, these plasma structures are shown to be "active fossil bubbles".
url https://www.ann-geophys.net/25/2099/2007/angeo-25-2099-2007.pdf
work_keys_str_mv AT rsekar identificationofactivefossilbubblesbasedoncoordinatedvhfradarandairglowmeasurements
AT dchakrabarty identificationofactivefossilbubblesbasedoncoordinatedvhfradarandairglowmeasurements
AT ssarkhel identificationofactivefossilbubblesbasedoncoordinatedvhfradarandairglowmeasurements
AT akpatra identificationofactivefossilbubblesbasedoncoordinatedvhfradarandairglowmeasurements
AT cvdevasia identificationofactivefossilbubblesbasedoncoordinatedvhfradarandairglowmeasurements
AT mckelley identificationofactivefossilbubblesbasedoncoordinatedvhfradarandairglowmeasurements
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