Midlatitude bursts of PiB geomagnetic pulsations and night airglow during stormtime sawtooth events

Мишин, В. М.; Klibanova, Yu. Yu.; Marchuk, Roman; Михалев, А. В.; Penskikh, Yury

doi:10.1016/j.asr.2023.06.032

Cited by 1 publication

(1 citation statement)

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“…The onset time of the expansion phase of substorms used in this study was compiled by Newell and Gjerloev (2011) and has been extensively employed in space physics studies (e.g., Beharrell et al, 2015;Fejer & Navarro, 2022;Wang & Lühr, 2021;Zhong et al, 2022). The sawtooth event list was established by Cai and Clauer (2009) and used in some interesting studies (Mishin et al, 2023;Walach et al, 2017). We selected 145 isolated substorms occurring during sawtooth events from June 2001 to December 2007.…”

Section: Methodsmentioning

confidence: 99%

Responses of Ionospheric F Layer Radial Current to Substorms During Sawtooth Events

Zhong,

Wang,

Zhang

et al. 2024

Geophysical Research Letters

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Using Challenging Minisatellite Payload (CHAMP) observations, responses of ionospheric radial current (IRC) in F‐layer to sawtooth substorms in different magnetic local times are investigated. The zonal wind effect alone cannot entirely explain the variability of the substorm time disturbance IRC. When substorms commence amid stable southward interplanetary magnetic field (IMF), it induces an eastward (westward) equatorial electric field in the daytime (nighttime). This electric field induces an equatorward (poleward) Hall current at low latitudes, consequently generating an upward (downward) perturbation in IRC. Conversely, substorms with varying IMF Bz, where IMF is southward but with a reduced magnitude or turned north after the onset, induce a westward (eastward) equatorial electric field in the daytime (nighttime). This electric field induces a poleward (equatorward) Hall current at low latitudes, consequently generating a downward (upward) disturbed IRC. Notably, this effect is primarily attributed to the varying IMF Bz rather than solely to substorm onset.

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