Observational evidence of equatorial ionospheric response to severe cyclonic storms 'AILA' and 'WARD' observed over the North Indian Ocean

被引：4

作者：

Bhagavathiammal, G. J. ^{[1
]}

Lal, Manohar ^{[2
]}

Emperumal, K. ^{[3
]}

机构：

[1] Anna Univ, Dept Med Phys, CEG Campus,Sardar Patel Rd, Chennai 600025, Tamil Nadu, India

[2] Indian Inst Geomagnetism, KS Krishnan Geomagnet Res Lab, Allahabad 211019, Uttar Pradesh, India

[3] Indian Inst Geomagnetism, Equatorial Geophys Res Lab, Tirunelveli 627011, Tamil Nadu, India

来源：

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS | 2020年 / 211卷

基金：

美国海洋和大气管理局;

关键词：

Tropical cyclone; Ionosphere; Gravity waves; Convection; GRAVITY-WAVES; TROPICAL CYCLONE; IMPACT; DISTURBANCES; OSCILLATIONS; PROPAGATION; PLANETARY; ORIGIN;

D O I：

10.1016/j.jastp.2020.105462

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

This work addresses the vertical atmosphere -ionosphere coupling through two cyclonic events AILA (23-26 May 2009) and 'WARD' (10-16 December 2009) observed over the North Indian Ocean. Combined ground Digisonde Tirunelveli (8.7(o)N, 77.8(o)E) observation, ECMWF reanalysis, and NOAA Outgoing Longwave Radiation data used to reveal the connection between atmosphere -ionosphere system. At the time of tropical cyclone, we observed a decrease in surface pressure and an increase of sustained oceanic winds. Thereby increases the tropical convection observed from the lowered OLR (Outgoing Longwave Radiation). The existence of Gravity wave oscillations of period similar to 4 h at the stratosphere and ionosphere regions indicate the propagation of low-frequency GWs (Gravity Waves) from the lower atmosphere. Weak eastward stratospheric winds observed at the time of onset of the cyclonic storm in both AILA and WARD events. The Ionospheric parameter foF2 and h'F2 show strong modulation at the time of cyclones AILA and WARD.

引用

页数：10