17 Apr 2024
 | 17 Apr 2024
Status: this preprint is open for discussion.

Substorm Signatures in the Dayside Magnetosphere

Sanjay Kumar and Tuija I. Pulkkinen

Abstract. We investigate variations in the position of the magnetopause in response to the interplanetary magnetic field (IMF), and different phases of magnetospheric substorms. The average location of magnetopause is examined using magnetic field observations from multiple satellites (THEMIS, RBSP, and MMS), and the Shue model utilizing OMNI solar wind data for a period of five years from 2016–2020. We estimate average position of the magnetopause using Shue model through superposed epoch analysis of standoff distance and tail flaring angle at different substorm timings (onset, peak and end) and from in-situ measurements through 2D equatorial maps of average Δ BZ under IMF |Bz|> 0 conditions. Our findings reveal the occurrence of substorms during both northward and southward IMF orientations and highlight an earthward movement of the magnetopause during substorm onset and peak, followed by a relaxation during the substorm end time, for both northward and southward IMF orientations. Notably, the magnetopause undergoes significant compression and reaches its closest point to the Earth during instances of strong southward IMF (BZ < -5), particularly during the substorm peak. The empirical model provides accurate estimation of the magnetopause location during periods of both strong northward and southward IMF |Bz|>5, as the model curve traverses a distinct location (Δ BZ = 0) representing the magnetopause shown in the 2D average map of Δ BZ.

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Sanjay Kumar and Tuija I. Pulkkinen

Status: open (until 26 Jun 2024)

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  • RC1: 'Comment on egusphere-2024-1113', Anonymous Referee #1, 22 May 2024 reply
Sanjay Kumar and Tuija I. Pulkkinen
Sanjay Kumar and Tuija I. Pulkkinen


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Short summary
We analyze magnetopause location, influenced by solar wind and IMF. Shue's (1998) model predicts its position based on solar wind pressure & IMF Bz. We investigate its location under northward/southward IMF & substorms using Shue's model & THEMIS/RBSP/MMS data. We observe significant magnetopause compression during strong northward/southward IMF around substorm peak.