Search Publications
EIT wave observations and modeling in the STEREO era
Zhukov, Andrei N.
"EIT waves" are large-scale bright fronts observed propagating in the solar corona in association with coronal mass ejections (CMEs). An overview of the observed properties of large-scale wave-like fronts in the solar atmosphere (Moreton waves, EIT waves and similar phenomena observed in other wavelengths) is presented. The models proposed to expl…
Solar cycle evolution of the heliospheric magnetic field: The Ulysses legacy
Smith, E. J.
Important contributions of Ulysses to understanding the solar cycle evolution of the heliospheric magnetic field (HMF) and solar wind are reviewed: a dramatic reorientation of the HMF as the solar dipole rotates between axial and equatorial orientations; solar cycle variation of the total heliospheric magnetic flux and its response to changes in s…
Coronal mass ejections—Propagation time and associated internal energy
Mujiber Rahman, A.; Manoharan, P. K.
In this paper, we analyze 91 coronal mass ejection (CME) events studied by Manoharan et al. (2004) and Gopalswamy and Xie (2008). These earth-directed CMEs are large (width >160∘) and cover a wide range of speeds (∼120-2400kms-1) in the LASCO field of view. This set of events also includes interacting CMEs and some of them…
Responses of the ionospheric electric field to the sheath region of ICME: A case study
Wei, Y.; Zong, Q. -G.; Guo, J. +8 more
We have examined the response of ionospheric electric field to the ICME sheath with the coordinated ground- and space-based magnetic measurements during the initial phase of December 14, 2006 storm. The duskward IEF pulses enhanced the westward convection electrojet and the eastward equatorial ionospheric electric field. The in situ magnetic measu…
Modeling of the turbulent plasma sheet during quiet geomagnetic conditions
Stepanova, M.; Antonova, E. E.
Recent studies have shown the importance of turbulent processes in the Earth magnetosphere dynamics, including the plasma sheet stability. In this study, turbulent eddy-diffusion coefficients were derived using the Cluster satellite data. The corresponding values of dawn-dusk electric field potential were obtained from the SuperDarn measurements. …
Aspects of magnetopause/magnetosphere response to interplanetary discontinuities, and features of magnetopause Kelvin-Helmholtz waves
Farrugia, C. J.; Gratton, F. T.
We describe (i) perturbations of the magnetopause/magnetosphere elicited by an interplanetary discontinuity and (ii) the production of Kelvin-Helmholtz waves on the magnetopause. These are two large topics, so for reasons of space we combine both features in a single data example, supporting the observations by theory. Correspondingly, the observa…
Geoefficiency of solar wind discontinuities
Palmroth, M.; Pulkkinen, T. I.; Andreeova, K. +1 more
We have investigated the solar wind-magnetosphere coupling efficiency in response to solar wind dynamic pressure enhancements. We investigate fast forward shocks, corotating interaction regions (CIRs), and pressure pulses separately, by conducting a statistical driver-response analysis. We complement the observations by results from the GUMICS-4 g…
The response of the polar cusp to a high-speed solar wind stream studied by a multispacecraft wavelet analysis
Zong, Q. -G.; Mouikis, C. G.; Korth, A. +3 more
We investigate the coupling between the solar wind and the magnetospheric cusp during the passage of a Corotating Interaction Region (CIR) high-speed stream. A CIR event on 11 January 2002 is selected for this study. We use ACE (Advanced Composition Explorer) and Geotail plasma and magnetic field data for interplanetary solar wind observations and…
A computational study of nonresonant cross-field diffusion of energetic particles due to their interaction with interplanetary magnetic decreases
Costa, E.; Lakhina, G. S.; Tsurutani, B. T. +4 more
We present a new method of calculating cross-field diffusion of charged particles due to their interactions with interplanetary magnetic decreases (MDs) in high heliospheric latitudes. We use a geometric model that evaluates perpendicular diffusion to the ambient magnetic field as a function of particle's gyroradius, MD radius, ratio between field…
A pseudo-magnetic flux rope observed by the THEMIS satellites in the Earth's magnetotail
Sarafopoulos, D. V.
We investigate an extraordinary event showing all the typical magnetic flux rope (MFR) signatures, although it is not really a MFR structure. It occurred on 1 March 2008 in the Earth's magnetotail and was observed by a major tail conjunction of Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellites. THEMIS B and C …