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DC Field | Value | Language |
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dc.contributor.author | Joshi, L.M. | |
dc.date.accessioned | 2017-11-06T09:50:56Z | |
dc.date.accessioned | 2021-02-12T10:07:28Z | - |
dc.date.available | 2017-11-06T09:50:56Z | |
dc.date.available | 2021-02-12T10:07:28Z | - |
dc.date.issued | 2016 | |
dc.identifier.citation | JGR, 121, doi: 10.1002/2016JA022659 | en_US |
dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/1054 | - |
dc.description.abstract | A comprehensive investigation of spread F irregularities over the Indian sector has been carried out using VHF radar and ionosonde observations. Two different categories of spread F observations, one where the onset of the range spread F (RSF) was concurrent with the peak h′F (category 1) and another where the RSF onset happened ~90 min after the peak h′F time (category 2), are presented. RSF in category 2 was preceded by the presence of oblique echoes in ionograms, indicating the irregularity genesis westward of Sriharikota. The average peak h′F in category 1 was ~30 km higher than that in category 2 indicating the presence of standing large-scale wave structure (LSWS). Occurrence of the blanketing Es during 19:30 to 20:30 Indian Standard Time in category 1 (category 2) was 0% (>50%). Model computation is also carried out to further substantiate the observational results. Model computation indicates that zonal variation of low-latitude Es can generate zonal modulation in the F layer height rise. It is found that the modulation of the F layer height, linked with the low-latitude Es, assists the equatorial spread F onset by modifying both the growth rate of the collisional Rayleigh-Taylor (R-T) instability and also its efficiency. A predominant presence of low-latitude Es has been observed, but the increase in the F layer height and the R-T instability growth in the evening hours will maximize with complete absence of low-latitude Es. A new mechanism for the generation of LSWS and its implications on R-T instability is discussed. | en_US |
dc.language.iso | en | en_US |
dc.subject | Rayleigh-Taylor instability | en_US |
dc.subject | Large-scale Wave Structure | en_US |
dc.subject | RT insatbility | en_US |
dc.subject | Low-latitude Es | en_US |
dc.title | LSWS linked with the low-latitude Es and its implications for the growth of the R-T instability | en_US |
dc.type | Article | en_US |
dc.identifier.accession | 091596 | |
Appears in Collections: | UAS_Reprints |
Files in This Item:
File | Description | Size | Format | |
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JoshiLM_JGR_2016.pdf | 1.43 MB | Adobe PDF | View/Open |
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