Investigation of equatorial plasma bubble irregularities under quiet and disturbed geomagnetic conditions over the East African longitudinal sector in 2015

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.2024.12.012

Zerihun Alemu , Tsegaye Kassa

{"title":"Investigation of equatorial plasma bubble irregularities under quiet and disturbed geomagnetic conditions over the East African longitudinal sector in 2015","authors":"Zerihun Alemu , Tsegaye Kassa","doi":"10.1016/j.asr.2024.12.012","DOIUrl":null,"url":null,"abstract":"<div><div>In this paper, we investigated the behavior of equatorial plasma bubble irregularities under quiet and disturbed geomagnetic conditions in the year 2015. Total Electron Content (TEC) data was obtained from four Global Navigation Satellite System (GNSS) receivers situated at Addis Ababa (ADIS), Bahir Dar (BDMT), ASAB (ASAB), and Debark (DEBK). We used Rate of TEC change index (ROTI) to describe ionospheric irregularities associated with plasma bubbles. The monthly occurrence rates (MOR) is obtained to be higher in equinoctial and lower in solstitial months at all stations. Moreover, the seasonal occurrence rates of plasma bubbles (SOR) show equinoctial and solstitial asymmetries. The seasonal occurrence rate in March equinox is higher than that of the September equinox during both quiet and disturbed geomagnetic conditions. Similarly, higher occurrence rate is observed in June than December solstice in quiet geomagnetic conditions. We have also investigated that the occurrence rate of plasma bubble is higher in geomagnetic quiet conditions than disturbed conditions at all stations. Moreover, there is also excellent correlation with high degree of significance between the monthly occurrence rates of plasma bubbles and the monthly mean F10.7 index and sunspot number at all stations. The occurrence times of plasma bubbles are almost similar in the four stations and most of the irregularities (around 95 <span><math><mrow><mo>%</mo></mrow></math></span>of the total irregularities) are observed in times between postsunset and midnight hours. The daily, monthly, and seasonal variations of ROTI also demonstrate similarity with the variation of the occurrence rates of plasma bubbles.</div></div>","PeriodicalId":50850,"journal":{"name":"Advances in Space Research","volume":"75 4","pages":"Pages 3671-3691"},"PeriodicalIF":2.8000,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advances in Space Research","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0273117724012249","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}

引用次数: 0

Abstract

In this paper, we investigated the behavior of equatorial plasma bubble irregularities under quiet and disturbed geomagnetic conditions in the year 2015. Total Electron Content (TEC) data was obtained from four Global Navigation Satellite System (GNSS) receivers situated at Addis Ababa (ADIS), Bahir Dar (BDMT), ASAB (ASAB), and Debark (DEBK). We used Rate of TEC change index (ROTI) to describe ionospheric irregularities associated with plasma bubbles. The monthly occurrence rates (MOR) is obtained to be higher in equinoctial and lower in solstitial months at all stations. Moreover, the seasonal occurrence rates of plasma bubbles (SOR) show equinoctial and solstitial asymmetries. The seasonal occurrence rate in March equinox is higher than that of the September equinox during both quiet and disturbed geomagnetic conditions. Similarly, higher occurrence rate is observed in June than December solstice in quiet geomagnetic conditions. We have also investigated that the occurrence rate of plasma bubble is higher in geomagnetic quiet conditions than disturbed conditions at all stations. Moreover, there is also excellent correlation with high degree of significance between the monthly occurrence rates of plasma bubbles and the monthly mean F10.7 index and sunspot number at all stations. The occurrence times of plasma bubbles are almost similar in the four stations and most of the irregularities (around 95

%

of the total irregularities) are observed in times between postsunset and midnight hours. The daily, monthly, and seasonal variations of ROTI also demonstrate similarity with the variation of the occurrence rates of plasma bubbles.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

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.