IONOSPHERIC RESPONSE TO CME AND CIR DRIVEN GEOMAGNETIC STORM OVER ETHIOPIA FROM 2013-2017

Wubet, Chernet

dc.contributor.author	Wubet, Chernet
dc.date.accessioned	2021-08-07T08:11:38Z
dc.date.available	2021-08-07T08:11:38Z
dc.date.issued	2021-08-07
dc.identifier.uri	http://ir.bdu.edu.et/handle/123456789/12315
dc.description.abstract	In this paper, we present the responses of the ionospheric total electron content (TEC) to coronal mass ejection (CME), and co-rotating interaction region (CIR) driven storms using stations that lie 37 E-39 E geographic longtude in low latitude region from 2013-2017. CME driven geomagnetic storm generally characterised by strong magnetic ﬁeld, low proton temperature, enhanced solar wind speed and short recovery phase, while CIR driven storm have been characterised by weak magnetic ﬁeld, high temperature and long recovery phase as compared with CME driven storm. Disturbance time index(Dst <-88nT ) were considered for this study. In this study three CIR and seven CME driven geomagnetic storm has been selected with available TEC data over the selected year and GPS station. TEC data used in this study was derived from the Global Navigation Satellite System observations in RINEX format, that processed by Gps-Gopi soft ware, and ploted by matlab program by importing the ﬁle. Statistical analysis of ionospheric storm effect were computed over the selected GPS station by computing VTEC deviation from quiet day monthly running median of VTEC. The number of CIR driven storm is more dominant during the decline phase of the solar cycle period. The number of CME is maximum during March equinox and June solistic. Our analysis had been shown positive ionospheric response is more prolonged during the recovery for CIR driven storm in the evenning and non signiﬁcant response during the main phase. Positive ionospheric response highly observed during the main and recovery phase of CME driven driven storm. On low latitude, most positive response obserbed before sunrise at around the midnight due to higher order of ionospheric irregularity. min	en_US
dc.language.iso	en_US	en_US
dc.subject	Physics	en_US
dc.title	IONOSPHERIC RESPONSE TO CME AND CIR DRIVEN GEOMAGNETIC STORM OVER ETHIOPIA FROM 2013-2017	en_US
dc.type	Thesis	en_US