Search Publications
Scattering characteristics and imaging of energetic neutral atoms from the Moon in the terrestrial magnetosheath
Barabash, Stas; Futaana, Yoshifumi; Wieser, Martin +6 more
We study hydrogen energetic neutral atom (ENA) emissions from the lunar surface, when the Moon is inside the terrestrial magnetosheath. The ENAs are generated by neutralization and backscattering of incident protons of solar wind origin. First, we model the effect of the increased ion temperature in the magnetosheath (>10 times larger than that…
A sequence of flux transfer events potentially generated by different generation mechanisms
Fazakerley, A. N.; Fear, R. C.; Trattner, K. J. +2 more
Flux transfer events (FTEs) are magnetic structures generated by time-varying reconnection at the dayside magnetopause. Understanding their generation mechanism is important, because it is necessary in order to understand the global contribution of FTEs to the convection process. We present observations of several FTEs sequentially observed by Clu…
Van Allen Probes, THEMIS, GOES, and Cluster observations of EMIC waves, ULF pulsations, and an electron flux dropout
Green, J. C.; Santolík, O.; Carr, C. +9 more
We examined an electron flux dropout during the 12-14 November 2012 geomagnetic storm using observations from seven spacecraft: the two Van Allen Probes, Time History of Events and Macroscale Interactions during Substorms (THEMIS)-A (P5), Cluster 2, and Geostationary Operational Environmental Satellites (GOES) 13, 14, and 15. The electron fluxes f…
CME flux rope and shock identifications and locations: Comparison of white light data, Graduated Cylindrical Shell model, and MHD simulations
St. Cyr, O. C.; Gopalswamy, N.; Cairns, Iver H. +2 more
Coronal mass ejections (CMEs) are major transient phenomena in the solar corona that are observed with ground-based and spacecraft-based coronagraphs in white light or with in situ measurements by spacecraft. CMEs transport mass and momentum and often drive shocks. In order to derive the CME and shock trajectories with high precision, we apply the…
An empirical model of ion plasma in the inner magnetosphere derived from CRRES/MICS measurements
Fennell, J. F.; Claudepierre, S. G.; Chen, M. W. +1 more
We describe an empirical model of energetic ion plasma (∼20-400 keV/q) that is constructed from measurements taken by the Magnetospheric Ion Composition Spectrometer (MICS) instrument that flew on the CRRES spacecraft. This is a unique data set in that it provides energetic ion composition in the near-equatorial ring current region during a very a…
Oxygen ion response to proton bursty bulk flows
Karlsson, Tomas; Nilsson, Hans; Gunell, Herbert +6 more
We have used Cluster spacecraft data from the years 2001 to 2005 to study how oxygen ions respond to bursty bulk flows (BBFs) as identified from proton data. We here define bursty bulk flows as periods of proton perpendicular velocities more than 100 km/s and a peak perpendicular velocity in the structure of more than 200 km/s, observed in a regio…
Reconnection layer bounded by switch-off shocks: Dayside magnetopause crossing by THEMIS D
Phan, Tai; Eriksson, Stefan; Haaland, Stein +2 more
We discuss observations of reconnection, obtained by Time History of Events and Macroscale Interactions during Substorms (THEMIS) D during an outward bound traversal of the low-latitude dayside magnetopause. The reconnection signatures include high magnetic shear, a southward directed Alfvénic jet, bounded by slow-mode shocks near the switch-off l…
Substructures within a dipolarization front revealed by high-temporal resolution Cluster observations
Fazakerley, A. N.; Owen, C. J.; Guo, R. L. +8 more
The dipolarization front (DF), usually observed near the leading edge of a bursty bulk flow (BBF), is thought to carry an intense current sufficient to modify the large-scale near-Earth magnetotail current system. However, the physical mechanism of the current generation associated with DFs is poorly understood. This is primarily due to the limita…
Characteristics of field-aligned currents associated with magnetic flux ropes in the magnetotail: A statistical study
Zhao, Yan; Wang, Rongsheng; Du, Aimin
We present an investigation of 35 magnetic flux ropes encountered by Cluster in the Earth's magnetotail during the years between 2001 and 2004. The study shows that the parallel current dominates inside 86% of the identified flux ropes and 71% of the flux ropes are surrounded by the draping regions where the parallel current is comparable to the p…
Photochemistry of forbidden oxygen lines in the inner coma of 67P/Churyumov-Gerasimenko
Gunell, H.; Altwegg, K.; Fuselier, S. A. +19 more
Observations of the green and red-doublet emission lines have previously been realized for several comets. We present here a chemistry-emission coupled model to study the production and loss mechanisms of the O(1S) and O(1D) states, which are responsible for the emission lines of interest for comet 67P/Churyumov-Gerasimenko. …