The equatorial electrojet during geomagnetic storms and substorms

Yamazaki (YY), Yosuke and Kosch, Michael (2015) The equatorial electrojet during geomagnetic storms and substorms. Journal of Geophysical Research: Space Physics, 120 (3). pp. 2276-2287. ISSN 2169-9402

[thumbnail of Yamazaki and Kosch_2015]
PDF (Yamazaki and Kosch_2015)
Yamazaki_and_Kosch_2015.pdf - Published Version
Available under License Creative Commons Attribution.

Download (2MB)


The climatology of the equatorial electrojet during periods of enhanced geomagnetic activity is examined using long-term records of ground-based magnetometers in the Indian and Peruvian regions. Equatorial electrojet perturbations due to geomagnetic storms and substorms are evaluated using the disturbance storm time (Dst) index and auroral electrojet (AE) index, respectively. The response of the equatorial electrojet to rapid changes in the AE index indicates effects of both prompt penetration electric field and disturbance dynamo electric field, consistent with previous studies based on F region equatorial vertical plasma drift measurements at Jicamarca. The average response of the equatorial electrojet to geomagnetic storms (Dst<−50 nT) reveals persistent disturbances during the recovery phase, which can last for approximately 24 h after the Dst index reaches its minimum value. This “after-storm” effect is found to depend on the magnitude of the storm, solar EUV activity, season, and longitude.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Geophysical Research: Space Physics
Additional Information:
©2015. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords:
?? equatorial electrojetionospheric currentsgeomagnetic stormsprompt penetration electric fielddisturbance dynamo electric fieldground-based magnetometersdiscipline-based research ??
ID Code:
Deposited By:
Deposited On:
14 Apr 2015 09:22
Last Modified:
29 May 2024 01:13