Westward ionospheric electric field perturbations on the dayside associated with substorm processes
-
- Y. Wei
- School of Earth and Space Sciences Peking University Beijing China
-
- Z. Pu
- School of Earth and Space Sciences Peking University Beijing China
-
- M. Hong
- Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
-
- Q. Zong
- School of Earth and Space Sciences Peking University Beijing China
-
- Z. Ren
- Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
-
- S. Fu
- School of Earth and Space Sciences Peking University Beijing China
-
- L. Xie
- School of Earth and Space Sciences Peking University Beijing China
-
- S. Alex
- Indian Institute of Geomagnetism Navi Mumbai India
-
- X. Cao
- School of Earth and Space Sciences Peking University Beijing China
-
- J. Wang
- School of Earth and Space Sciences Peking University Beijing China
-
- X. Chu
- School of Earth and Space Sciences Peking University Beijing China
書誌事項
- 公開日
- 2009-12
- 権利情報
-
- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
-
- 10.1029/2009ja014445
- 公開者
- American Geophysical Union (AGU)
この論文をさがす
説明
<jats:p>A controversy has risen in the direction of ionospheric electric field perturbation on the dayside caused by substorm expansion phase in recent years, i.e., eastward or westward. To exclude the effect of interplanetary magnetic field northward turning, the substorms without interplanetary field (IMF) trigger are required to investigate this issue. Previous works, such as that by Huang et al. (2004), showed that the eastward electric field perturbations caused by substorms can be observed. However, our case suggests that some substorms can produce strong westward electric field perturbations and drive westward equatorial electrojets on the dayside ionosphere. This westward electric field is created by an overshielding‐like imbalance state of field‐aligned currents (FACs), Region 2 (R2) FAC greater than Region 1 (R1) FAC, which is built up through R2 FAC enhancement rather than R1 FAC reduction due to IMF northward turning. The substorm processes should be responsible for the westward electric field especially through polar cap shrinkage and magnetic field dipolarization.</jats:p>
収録刊行物
-
- Journal of Geophysical Research: Space Physics
-
Journal of Geophysical Research: Space Physics 114 (A12), A12209-, 2009-12
American Geophysical Union (AGU)
