Search Publications
Plasma and energetic particle behaviors during asymmetric magnetic reconnection at the magnetopause
Glassmeier, K. -H.; Zhang, H.; Zong, Q. -G. +6 more
The factors controlling asymmetric reconnection and the role of the cold plasma population in the reconnection process are two outstanding questions. We present a case study of multipoint Cluster observations demonstrating that the separatrix and flow boundary angles are greater on the magnetosheath than on the magnetospheric side of the magnetopa…
Hydrocarbon ions in the lower ionosphere of Saturn
Moses, J. I.; Black, J. H.; Kim, Y. H. +1 more
Radio occultation measurements of the Saturn ionosphere have shown that persistent but variable electron density layers appear well below the major peaks. We model here the region of hydrocarbon ions that is below the main peak and is produced by absorption of solar photons in the wavelength range 842 to 1116 Å, which penetrate to altitudes below …
Transmission of large-amplitude ULF waves through a quasi-parallel shock at Venus
Zhang, Tielong; Wang, Shui; Huang, Can +4 more
There exist large-amplitude ultralow frequency (ULF) waves in the upstream region of a quasi-parallel shock, which are excited due to the reflected ions by the shock. These waves are then brought back to the shock by the solar wind, and at last they coalesce and merge with the shock. In this paper, with the magnetic field measurements from Venus E…
Magnetic fluctuations embedded in dipolarization inside geosynchronous orbit and their associated selective acceleration of O+ ions
Kistler, L. M.; Miyashita, Y.; Keika, K. +7 more
We study magnetic fluctuations embedded in dipolarizations in the inner magnetosphere (a geocentric distance of ≤6.6 RE) and their associated ion flux changes, using the Engineering Test Satellite VIII and Active Magnetospheric Particle Tracer Explorers/CCE satellites. We select seven events of dipolarization that occur during the main …
Magnetic clouds and origins in STEREO era
Luhmann, J. G.; Kilpua, E. K. J.; Lynch, B. J. +1 more
When a coronal mass ejection (CME) encounters the Earth, the Earth's electromagnetic environment is disturbed, especially when it is a magnetic cloud (MC) with enhanced, steady, and long-lasting southward field. The speed and the magnetic field of an MC are the two important properties for its geoeffectiveness. The correspondence between a CME and…
Proton acceleration at two-dimensional dipolarization fronts in the magnetotail
Artemyev, A.; Zimbardo, G.; Greco, A.
Transient reconnection events in the planetary magnetotail give rise to fast plasma jets, whose leading edges are called dipolarization fronts. We perform a test particle simulation of ion acceleration in a 2-D model of dipolarization fronts. We study the dependence of acceleration on several parameters of the model. We obtain that the interaction…
Correlation of core field polarity of magnetotail flux ropes with the IMF By: Reconnection guide field dependency
Zhang, T. L.; Nakamura, R.; Baumjohann, W. +2 more
The relationship between the core field and the interplanetary magnetic field (IMF) By has been addressed by spacecraft observations in the magnetotail, but it is not yet fully clear since observations by Slavin et al. (2003) and Borg et al. (2012) show controversial results. In this study, we examine 13 flux ropes from the Cluster obse…
IMF control of the location of Venusian bow shock: The effect of the magnitude of IMF component tangential to the bow shock surface
Barabash, Stas; Zhang, Tielong; Rong, Zhaojin +7 more
The interplanetary magnetic field (IMF) frozen in the solar wind, together with the solar EUV radiation, can significantly affect the location of Venusian bow shock. To recognize the IMF effect on the Venusian bow shock, we investigated 1680 bow shock crossings recorded by Venus Express during the unusually long-lasting solar minimum (May 2006 to …
Evidence of deflected super-Alfvénic electron jet in a reconnection region with weak guide field
Xu, Xiaojun; Yuan, Zhigang; Huang, Shiyong +4 more
Recent numerical simulations demonstrated that electron diffusion region develops into two-scale structure, i.e., the inner electron diffusion region and the outer electron diffusion region. The outer diffusion region is manifested as super-Alfvénic electron jet embedded in central current sheet. However, the electron jets are deflected from neutr…
Spectrum characteristics of electromagnetic ion cyclotron triggered emissions and associated energetic proton dynamics
Omura, Yoshiharu; Shoji, Masafumi
We perform parametric analyses of electromagnetic ion cyclotron (EMIC) triggered emissions with a gradient of the nonuniform ambient magnetic field using a hybrid simulation. According to nonlinear wave growth theory, as the gradient of the ambient magnetic field becomes larger, the theoretical threshold of the wave amplitude becomes larger, altho…