First observational investigation on the temporal trends of Vertical Total Electron Content (VTEC) over an equatorial station: Discerning the impacts of Mora and Ockhi – Two tropical cyclones in 2017

IF 2.8 3区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Advances in Space Research Pub Date : 2025-02-15 DOI:10.1016/j.asr.2024.11.078

Swati Chowdhury, D. Bala Subrahamanyam, R.K. Choudhary

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Abstract

This study examines the impact of two tropical cyclones (Mora and Ockhi, 2017) over the Northern Indian Ocean on vertical total electron content (VTEC) over Trivandrum, by comparing data from similar periods in 2018 and 2019. To ensure accuracy, a precise data-screening method was implemented to exclude the potential effects of geomagnetic storms and other tropical cyclones on VTEC. Results showed a significant depletion in VTEC, ranging from 7% to 19%, which varied based on the intensity of the cyclones and their distance from the measurement site. The period analyzed coincided with the declining phase of the 24th solar cycle, during which VTEC naturally decreased from 2017 to 2019. The present analysis reports a sharp depletion in the VTEC during the passage of the cyclone, the first of its kind, emphasizing the TC-influence on the upper atmosphere, which was seen to extend even after the landfall.

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2017年赤道站垂直总电子含量（VTEC）变化趋势的首次观测研究：莫拉和奥基两个热带气旋的影响

本研究通过比较2018年和2019年类似时期的数据，研究了北印度洋上的两个热带气旋（Mora和Ockhi， 2017）对特里vandrum上空垂直总电子含量（VTEC）的影响。为了保证准确性，采用了精确的数据筛选方法来排除地磁风暴和其他热带气旋对VTEC的潜在影响。结果显示，VTEC显著减少，从7%到19%不等，这取决于气旋的强度及其与测量地点的距离。所分析的时期恰逢第24个太阳周期的下降阶段，在此期间，VTEC从2017年到2019年自然下降。本分析报告称，在气旋通过期间，VTEC急剧减少，这是第一次出现这种情况，强调了tc对高层大气的影响，这种影响甚至在登陆后仍在扩大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Space Research 地学天文-地球科学综合

CiteScore

5.20

自引率

11.50%

发文量

800

审稿时长

5.8 months

期刊介绍： The COSPAR publication Advances in Space Research (ASR) is an open journal covering all areas of space research including: space studies of the Earth''s surface, meteorology, climate, the Earth-Moon system, planets and small bodies of the solar system, upper atmospheres, ionospheres and magnetospheres of the Earth and planets including reference atmospheres, space plasmas in the solar system, astrophysics from space, materials sciences in space, fundamental physics in space, space debris, space weather, Earth observations of space phenomena, etc. NB: Please note that manuscripts related to life sciences as related to space are no more accepted for submission to Advances in Space Research. Such manuscripts should now be submitted to the new COSPAR Journal Life Sciences in Space Research (LSSR). All submissions are reviewed by two scientists in the field. COSPAR is an interdisciplinary scientific organization concerned with the progress of space research on an international scale. Operating under the rules of ICSU, COSPAR ignores political considerations and considers all questions solely from the scientific viewpoint.