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Tropical Ionospheric response to Very Severe Cyclonic Storm "BULBUL" observed over SANYA (18.34oN, 109.62oE)

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Title Tropical Ionospheric response to Very Severe Cyclonic Storm "BULBUL" observed over SANYA (18.34oN, 109.62oE)
 
Creator Bhagavathiammal, G J
Gajalakshmi, M
 
Subject Ionosphere
Tropical Cyclone
BULBUL
foF2
hmF2
Gravity Waves
 
Description 29-37
We present the tropical ionospheric response to a severe cyclonic storm, "BULBUL," observed from Ionosonde
observations over "SANYA" (18.34oN, 109.62oE). The cyclone "BULBUL" developed as a low pressure on 5 November 2019
and intensified into a Very Severe Cyclonic Storm (VSCS) on 8 November 2019, and a landfall occurred on 9 November 2019
over West Bengal. This study utilizes Ionospheric parameters foF2 and hmF2 during the cyclone (5-11 November 2019). The
cyclone period falls under quiet geomagnetic conditions (Kp < 3) and makes us investigate the lower atmospheric
meteorological event's impacts on the ionosphere. Significant modulation has been found in hmF2 and foF2 during cycloneintensified
stages (SCS, VSCS, Land fall) from 7-9 November 2019. Low OLR and upward vertical velocity are observed at the
matured stages, suggesting deep convection, generating Gravity Wave Oscillations. Local time profile reveals the severe
suppression in foF2 during the intensification and land falling day of the cyclone, and reversely hmF2 shows an increasing
trend. The peak value of hmF2 shifted from post-noon to prenoon hours during the progression of the cyclone (from SCS to
VSCS and landfall). In addition, we observed strong gravity wave oscillations of about ~3 and 5 hours in foF2.
 
Date 2023-12-27T05:54:19Z
2023-12-27T05:54:19Z
2023-12
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscpr.res.in/handle/123456789/63098
https://doi.org/10.56042/ijpap.v62i1.4078
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJPAP Vol.62(01) (January 2024]