Comparison between THEMIS observations of a Hot Flow Anomaly at the Earth's bow shock and global hybrid simulations

Details Comparison between THEMIS observations of a Hot Flow Anomaly at the Earth's bow shock and global hybrid simulations Comparison between THEMIS observations of a Hot Flow Anomaly at the Earth's bow shock and global hybrid simulations

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm51a..04e&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SM51A-04

Other

2704 Auroral Phenomena (2407), 7839 Nonlinear Phenomena (4400, 6944), 7851 Shock Waves (4455), 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

Hot Flow Anomalies are generated at the bow shock by otherwise unremarkable discontinuities in the solar wind magnetic field (measured at 1AU). They drastically reduce the solar wind ram pressure on minute timescales, and are thought to be responsible for a variety of magnetospheric signatures. Despite their intrinsic interest as a plasma physics phenomenon, and their impact on space weather prediction, a number of questions remain concerning thermalization mechanisms, occurrence rates, and their overall impact on the magnetosphere. Here, we present THEMIS observations of a Hot Flow Anomaly (HFA) at the Earth's bow shock, and compare them to the results of global hybrid simulations. At this time, the five THEMIS spacecraft were in a configuration unique to the first dayside season; three spacecraft were separated by a few hundred kilometers with the other two 1Re up and downstream. At the time of observation, THEMIS A was upstream of the bow shock, with the other spacecraft in the magnetosheath; this is a rare example where the event was observed on both sides of the bow shock. THEMIS A observed classical HFA signatures upstream and THEMIS E, just downstream, observed a density cavity disconnected from the underlying discontinuity, surrounded by fast mode perturbations. THEMIS B did not observe a strong HFA signature. To understand the observed signatures of the HFA in the upstream and downstream regions, we use global hybrid (kinetic ions, fluid electrons) simulations to examine the interaction of the discontinuity with the bow shock. The simulation results and their comparisons with the observations will be presented.

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