Publication:
D-region ionosphere response to the total solar eclipse of 22 July 2009 deduced from ELF-VLF tweek observations in the Indian sector

dc.contributor.coauthorSingh, Rajesh
dc.contributor.coauthorVeenadhari, B.
dc.contributor.coauthorMaurya, Ajeet K.
dc.contributor.coauthorCohen, Morris B.
dc.contributor.coauthorKumar, Sushil
dc.contributor.coauthorSelvakumaran, R.
dc.contributor.coauthorPant, P.
dc.contributor.coauthorSingh, Abhay K.
dc.contributor.departmentDepartment of Electrical and Electronics Engineering
dc.contributor.kuauthorİnan, Umran Savaş
dc.contributor.schoolcollegeinstituteCollege of Engineering
dc.date.accessioned2024-11-09T12:17:48Z
dc.date.issued2011
dc.description.abstractObservations of tweeks with higher harmonics (n > 1) at low latitude stations Allahabad and Nainital, in the Indian sector, during the total solar eclipse on 22 July 2009, are presented. Allahabad and Nainital stations were in 100% and 85% of the totality paths. Observations suggest that about 30-40% obscuration of solar disc can lead to the tweeks occurrence which otherwise occur only in nighttime. A total of 148 tweeks at Allahabad and 20 tweeks at Nainital were recorded with some of them up to 3rd harmonics. The World Wide Lightning Location Network data indicated that tweeks observed were generated by lightning's located in the partial eclipse area of Asia-Oceania region. The changes in D-region ionospheric VLF reflection height and electron density (similar to 22-23 cm(-3)) during eclipse have been estimated from the first cut-off frequency of the tweeks. The reflection height increased from similar to 89 km from the first occurrence of tweek to about 91-92 km at the totality and then decreased to similar to 87 km at the end of the eclipse, suggesting a change of about 5 km in the reflection height during eclipse. The reflection heights are lower by 2-3 km as compared to normal nighttime tweek reflection heights. The above increase in the reflection height indicate that the partial nighttime condition is created during eclipse, as the main D-region ionizing radiation Lyman alpha is blocked but solar soft X-ray and EUV radiations originating from the limb solar corona are not totally blocked which produce some of ionization in the D-region.
dc.description.fulltextYES
dc.description.indexedbyWOS
dc.description.indexedbyScopus
dc.description.issueA10
dc.description.openaccessYES
dc.description.publisherscopeInternational
dc.description.sponsoredbyTubitakEuN/A
dc.description.sponsorshipIndo-U.S. Research Fellowship
dc.description.sponsorshipStanford University, CA, USA
dc.description.sponsorshipCAWSES India, Phase-II
dc.description.versionPublisher version
dc.description.volume116
dc.identifier.doi10.1029/2011JA016641
dc.identifier.eissn2169-9402
dc.identifier.embargoNO
dc.identifier.filenameinventorynoIR00597
dc.identifier.issn2169-9380
dc.identifier.quartileN/A
dc.identifier.scopus2-s2.0-80053508710
dc.identifier.urihttps://doi.org/10.1029/2011JA016641
dc.identifier.wos295532500001
dc.keywords11 August 1999
dc.keywordsReflection Heights
dc.keywordsRadio Signals
dc.keywordsLow-Latitude
dc.keywordsAtmospherics
dc.keywordsPropagation
dc.keywordsNetwork
dc.keywordsAwesome
dc.keywordsWaves
dc.language.isoeng
dc.publisherAmerican Geophysical Union (AGU)
dc.relation.ispartofJournal of Geophysical Research: Space Physics
dc.relation.urihttp://cdm21054.contentdm.oclc.org/cdm/ref/collection/IR/id/651
dc.subjectAstronomy and astrophysics
dc.titleD-region ionosphere response to the total solar eclipse of 22 July 2009 deduced from ELF-VLF tweek observations in the Indian sector
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.kuauthorİnan, Umran Savaş
local.publication.orgunit1College of Engineering
local.publication.orgunit2Department of Electrical and Electronics Engineering
relation.isOrgUnitOfPublication21598063-a7c5-420d-91ba-0cc9b2db0ea0
relation.isOrgUnitOfPublication.latestForDiscovery21598063-a7c5-420d-91ba-0cc9b2db0ea0
relation.isParentOrgUnitOfPublication8e756b23-2d4a-4ce8-b1b3-62c794a8c164
relation.isParentOrgUnitOfPublication.latestForDiscovery8e756b23-2d4a-4ce8-b1b3-62c794a8c164

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