Middle and low latitudes hemispheric asymmetries in ∑O/N2 and TEC during intense magnetic storms of solar cycle 24

Younas, Waqar; Khan, Majid; Amory‐Mazaudier, Christine; Amaechi, P. O.; Fleury, Rolland

doi:10.1016/j.asr.2021.10.027

Cited by 9 publications

(7 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A similar discrepancy has also been reported in an earlier study by Younas, Khan, et al. (2021). The said disagreement may be associated with the fact that CTIPe model could not adequately take into account the effects of thermospheric Joule heating and atmospheric expansion at mid‐latitudes during the disturbed geomagnetic conditions.…”

Section: Discussionsupporting

confidence: 89%

“…The HSSWs during the recovery phase of a magnetic storm also cause significant changes in the thermospheric O/N 2 as reported by Younas, Khan, et al. (2021).…”

Section: Introductionsupporting

confidence: 54%

“…It is known that there are various physical phenomena associated with ionospheric disturbances during the storm‐time, for example, PPEF, DDEF, and thermospheric composition changes are major drivers of ionospheric variations induced by space weather activities (Blanc & Richmond, 1980; Burns et al., 1995; Huang et al., 2007; Kikuchi et al., 2008; Maruyama et al., 2007; Younas, Khan, et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

“…In this regard, average daily O/N 2 at low and mid‐latitudes are estimated using the methodology of Younas, Khan, et al. (2021). Then the linear trends—associated with regular seasonal variations—in the data are removed to estimate the disturbed O/N 2 . The disturbed ionospheric currents (D iono ) at low‐latitudes magnetic observatories are computed using the fitting technique of Younas, Amory‐Mazaudier, et al.…”

Section: Data Sets and Methodologymentioning

confidence: 99%

Section: Data Sets and Methodologymentioning

confidence: 99%

See 4 more Smart Citations

Ionospheric Response to the Coronal Hole Activity of August 2020: A Global Multi‐Instrumental Overview

et al. 2022

View full text Add to dashboard Cite

We have studied the ionospheric response to a coronal hole event of August 2020 using the data from global ionospheric maps, ground magnetometers and parameters from the instruments onboard SWARM and thermosphere, ionosphere, mesosphere energetics and dynamics satellites. The role of different physical drivers, responsible for observed ionospheric disturbance, has been identified. On the storm day (2 August), a steady southward directed interplanetary magnetic field Bz caused the penetration of magnetospheric convection electric field and positive storm effect in daytime sectors. As a result of prompt penetration electric field (PPEF) on 2 August, a polar‐ward expansion of day‐side ionospheric plasma. On 3 August, the signatures of both disturbance dynamo electric field (DDEF) caused by disturbed thermospheric winds and PPEF have been observed. The westward PPEF and eastward disturbance DDEF on the night‐side caused a strong enhancement in ionospheric plasma parameters at the corresponding sectors. The effect of disturbed thermospheric winds and resultant electric field persisted till the end of 7 August. The large decrease in O/N2 ratio at northern mid‐latitudes which is a consequence of the seasonal impact resulted in the negative storm effects at corresponding latitudinal regions. This study has shown that although the storm of August 2020 was a minor one, the associated high speed solar wind streams emanating from a coronal hole resulted in drastic changes in ionospheric parameters including global electron content, in situ electron density and total electron content at the equatorial ionization anomaly and equatorial electric field.

show abstract

Section: Discussionsupporting

confidence: 89%

“…The HSSWs during the recovery phase of a magnetic storm also cause significant changes in the thermospheric O/N 2 as reported by Younas, Khan, et al. (2021).…”

Section: Introductionsupporting

confidence: 54%