Local Time Variations of the Equatorial Electrojet in Simultaneous Response to Subauroral Polarization Streams During Quiet Time

Kedeng Zhang; Hui Wang; Wenbin Wang

doi:10.1029/2022GL098623

Local Time Variations of the Equatorial Electrojet in Simultaneous Response to Subauroral Polarization Streams During Quiet Time

Kedeng Zhang, Hui Wang, Wenbin Wang

Geospace Frontiers

Wuhan University

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Based on 1-year equatorial electrojet (EEJ) measurements from Swarm, and ion velocity from the Defense Meteorological Satellite Program, this study first examines the simultaneous effects of the subauroral polarization streams (SAPS) on EEJ during quiet time. The changes in EEJ (ΔEEJ) vary significantly with local time. ΔEEJ flows westward at dawn and is gradually enhanced to eastward at dusk. The eastward ΔEEJ at post-noon might be driven indirectly by the upward electric field associated with SAPS electric field at SAPS channel, whereas ΔEEJ at pre-noon might be directly attributed to the penetrating SAPS-related polarization electric field. Under stronger geomagnetic forcing, a stronger intensity of westward ΔEEJ at dawn and noon is produced, whereas a stronger eastward ΔEEJ at dusk is generated because of a faster SAPS velocity.

Original language	English
Article number	e2022GL098623
Journal	Geophysical Research Letters
Volume	49
Issue number	7
DOIs	https://doi.org/10.1029/2022GL098623
State	Published - Apr 16 2022

Access to Document

10.1029/2022GL098623

Cite this

@article{0a8820bb8f474133b9abaea9f505cef1,

title = "Local Time Variations of the Equatorial Electrojet in Simultaneous Response to Subauroral Polarization Streams During Quiet Time",

abstract = "Based on 1-year equatorial electrojet (EEJ) measurements from Swarm, and ion velocity from the Defense Meteorological Satellite Program, this study first examines the simultaneous effects of the subauroral polarization streams (SAPS) on EEJ during quiet time. The changes in EEJ (ΔEEJ) vary significantly with local time. ΔEEJ flows westward at dawn and is gradually enhanced to eastward at dusk. The eastward ΔEEJ at post-noon might be driven indirectly by the upward electric field associated with SAPS electric field at SAPS channel, whereas ΔEEJ at pre-noon might be directly attributed to the penetrating SAPS-related polarization electric field. Under stronger geomagnetic forcing, a stronger intensity of westward ΔEEJ at dawn and noon is produced, whereas a stronger eastward ΔEEJ at dusk is generated because of a faster SAPS velocity.",

author = "Kedeng Zhang and Hui Wang and Wenbin Wang",

year = "2022",

month = apr,

day = "16",

doi = "10.1029/2022GL098623",

language = "English",

volume = "49",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "John Wiley and Sons Inc.",

number = "7",

}

TY - JOUR

T1 - Local Time Variations of the Equatorial Electrojet in Simultaneous Response to Subauroral Polarization Streams During Quiet Time

AU - Zhang, Kedeng

AU - Wang, Hui

AU - Wang, Wenbin

PY - 2022/4/16

Y1 - 2022/4/16

N2 - Based on 1-year equatorial electrojet (EEJ) measurements from Swarm, and ion velocity from the Defense Meteorological Satellite Program, this study first examines the simultaneous effects of the subauroral polarization streams (SAPS) on EEJ during quiet time. The changes in EEJ (ΔEEJ) vary significantly with local time. ΔEEJ flows westward at dawn and is gradually enhanced to eastward at dusk. The eastward ΔEEJ at post-noon might be driven indirectly by the upward electric field associated with SAPS electric field at SAPS channel, whereas ΔEEJ at pre-noon might be directly attributed to the penetrating SAPS-related polarization electric field. Under stronger geomagnetic forcing, a stronger intensity of westward ΔEEJ at dawn and noon is produced, whereas a stronger eastward ΔEEJ at dusk is generated because of a faster SAPS velocity.

AB - Based on 1-year equatorial electrojet (EEJ) measurements from Swarm, and ion velocity from the Defense Meteorological Satellite Program, this study first examines the simultaneous effects of the subauroral polarization streams (SAPS) on EEJ during quiet time. The changes in EEJ (ΔEEJ) vary significantly with local time. ΔEEJ flows westward at dawn and is gradually enhanced to eastward at dusk. The eastward ΔEEJ at post-noon might be driven indirectly by the upward electric field associated with SAPS electric field at SAPS channel, whereas ΔEEJ at pre-noon might be directly attributed to the penetrating SAPS-related polarization electric field. Under stronger geomagnetic forcing, a stronger intensity of westward ΔEEJ at dawn and noon is produced, whereas a stronger eastward ΔEEJ at dusk is generated because of a faster SAPS velocity.

UR - https://www.scopus.com/pages/publications/85128450483

U2 - 10.1029/2022GL098623

DO - 10.1029/2022GL098623

M3 - Article

AN - SCOPUS:85128450483

SN - 0094-8276

VL - 49

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 7

M1 - e2022GL098623

ER -

Local Time Variations of the Equatorial Electrojet in Simultaneous Response to Subauroral Polarization Streams During Quiet Time

Abstract

Access to Document

Other files and links

Fingerprint

Cite this