Measurements of convection electric field in the inner magnetosphere
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In this paper, we study the characteristic of large-scale convection electric field in the inner magnetosphere, using magnetospheric multiscale (MMS) observations between L=5 and L=8 over the period from September 1, 2015 to October 31, 2016, covering almost all magnetic local time (MLT). Observations show that the DC convection electric field generally has small variations in this region. We investigate whether the convection electric field is correlated with geomagnetic indices and solar wind parameters. It is found that, among the studied parameters, solar wind electric field, z component of interplanetary magnetic field, AE and Kp indices show good correlations with the averaged convection electric field. The results in this paper provide valuable information for understanding the role of electric field on the dynamics of the inner magnetosphere.
Keywordsconvection electric field inner magnetosphere
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 41574154 and 41431071). We thank the FIELDS instrument team of MMS mission for making data available. We thank Dr. Yuri Khotyaintsev for helpful discussion. The solar parameters and geomagnetic indices are obtained from the OMNI database (https://doi.org/omniweb.gsfc.nasa.gov).
- 1.Fu H S, Tu J, Song P, et al. The nightside-to-dayside evolution of the inner magnetosphere: Imager for Magnetopause-to-Aurora Global Exploration Radio Plasma Imager observations. J Geophys Res, 2010, 115: A04213Google Scholar
- 3.Liu X, Liu W, Cao J B, et al. Dynamic plasmapause model based on THEMIS measurements. J Geophys Res Space Phys, 2015, 120: 543–556Google Scholar
- 7.Fu H S, Cao J B, Yang B, et al. Electron loss and acceleration during storm time: The contribution of wave-particle interaction, radial diffusion, and transport processes. J Geophys Res, 2011, 116: A10210Google Scholar
- 11.Wei Y, Pu Z, Hong M, et al. Westward ionospheric electric field perturbations on the dayside associated with substorm processes. J Geophys Res, 2009, 114: A12209Google Scholar
- 12.Wei Y, Pu Z, Hong M, et al. Long-lasting goodshielding at the equatorial ionosphere. J Geophys Res, 2010, 115: A12256Google Scholar
- 16.Ma Y D, Cao J B, Zhou G, et al. Multipoint analysis of the rapid convection event. Chin J Geophys, 2007, 1148: 189–199Google Scholar
- 17.Ding W Z, Cao J B, Zeng L, et al. Simulation studies of plasma sheet ion boundary. Chin J Geophys, 2010, 53: 1505–1514Google Scholar
- 32.Fu H S, Tu J, Cao J B, et al. IMAGE and DMSP observations of a density trough inside the plasmasphere. J Geophys Res, 2010, 115: A07227Google Scholar
- 35.Goldstein J, Sandel B R, Hairston M R, et al. Control of plasmaspheric dynamics by both convection and sub-auroral polarization stream. Geophys Res Lett, 2003, 30: 2243Google Scholar