The THEMIS Mission

Front Cover
James L. Burch, Vassilis Angelopoulos
Springer Science & Business Media, Mar 3, 2009 - Science - 583 pages
J.L. Burch·V. Angelopoulos Originally published in the journal Space Science Reviews, Volume 141, Nos 1–4, 1–3. DOI: 10.1007/s11214-008-9474-5 © Springer Science+Business Media B.V. 2008 The Earth, like all the other planets, is continuously bombarded by the solar wind, which is variable on many time scales owing to its connection to the activity of the Sun. But the Earth is unique among planets because its atmosphere, magnetic eld, and rotation rates are each signi cant, though not dominant, players in the formation of its magnetosphere and its reaction to solar-wind inputs. An intriguing fact is that no matter what the time scale of solar-wind variations, the Earth’s response has a de nite pattern lasting a few hours. Known as a magnetospheric substorm, the response involves a build-up, a crash, and a recovery. The build-up (known as the growth phase) occurs because of an interlinking of the geom- netic eld and the solar-wind magnetic eld known as magnetic reconnection, which leads to storage of increasing amounts of magnetic energy and stress in the tail of the mag- tosphere and lasts about a half hour. The crash (known as the expansion phase) occurs when the increased magnetic energy and stresses are impulsively relieved, the current system that supports the stretched out magnetic tail is diverted into the ionosphere, and bright, dynamic displays of the aurora appear in the upper atmosphere. The expansion and subsequent rec- ery phases result from a second magnetic reconnection event that decouples the solar-wind and geomagnetic elds.
 

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Contents

Foreword
2
The THEMIS Mission
5
THEMIS Science Objectives and Mission Phases
35
Orbit Design for the THEMIS Mission
61
THEMIS Operations
91
The THEMIS Constellation
117
Instrument Data Processing Unit for THEMIS
153
The THEMIS Magnetic Cleanliness Program
171
The THEMIS ESA Plasma Instrument and Inflight Calibration
277
The Electric Field Instrument EFI for THEMIS
303
The THEMIS Digital Fields Board
343
The THEMIS Array of Groundbased Observatories for the Study of Auroral Substorms
357
THEMIS GroundBased Magnetometers
389
The Upgraded CARISMA Magnetometer Array in the THEMIS Era
413
First Results from the THEMIS Mission
453
THEMIS ESA First Science Results and Performance Issues
477

Instrument Boom Mechanisms on the THEMIS Satellites Magnetometer Radial Wire and Axial Booms
185
THEMIS Ground Based Observatory System Design
213
The THEMIS Fluxgate Magnetometer
235
The Search Coil Magnetometer for THEMIS
265
First Results of the THEMIS Search Coil Magnetometers
509
OpenGGCM Simulations for the THEMIS Mission
535
The Time History of Events and Macroscale Interactions during Substorms THEMIS Education and Outreach EPO Program
557
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