Science Keywords>SUN-EARTH INTERACTIONS>IONOSPHERE/MAGNETOSPHERE DYNAMICS>ELECTRIC FIELDS/ELECTRIC CURRENTS
NASA THEMIS Mission Level 1 and 2 CDF DataEntry ID: THEMIS_L1_L2_DATA
Abstract: [Source: THEMIS Mission Home page at Space Sciences Laboratory, University of California, Berkeley, CA,
THEMIS answers longstanding fundamental questions concerning the nature of the substorm instabilities that abruptly and explosively release solar wind energy stored within the Earth?s magnetotail. The primary objectives of the mission are to
... 1. Establish when and where substorms begin
2. Determine how the individual components of the substorm interact
3. Determine how substorms power the aurora, and
4. Identify how local current disruption mechanisms couple to the more global substorm phenomena
THEMIS accomplishes these tasks by employing 5 identically-instrumented spacecraft in carefully chosen orbits whose apogees line up once every 4 days over a dedicated array of ground observatories located in Canada and the northern United States.
Three inner probes ~10 Earth radii (RE) from Earth monitor current disruption onset, while two outer probes at 20 and 30RE remotely monitor plasma acceleration due to lobe flux dissipation. Magnetic field lines map phenomena occurring at the inner spacecraft to the ground arrays, where they can be observed as nightside auroral displays and geomagnetic perturbations.
The array of spacecraft and ground observations will enable researchers to pinpoint when and where substorms begin, thereby distinguishing between models that begin with current disruption in the near-Earth magnetotail and those that begin with magnetic reconnection in the distant magnetotail. The same array of spacecraft and ground observatories permits researchers to link phenomena observed in the magnetotail to those observed in the ionosphere.
THEMIS employs flight-proven instruments and subsystems, yet demonstrates spacecraft design strategies ideal for Constellation class missions. THEMIS complements MMS and serves as a science and a technology pathfinder for future STP missions. THEMIS was launched on February 17, 2007.
Data Set Citation
Dataset Originator/Creator: NASA Contract NAS5-02099 and V. Angelopoulos
Dataset Title: NASA THEMIS Mission Level 1 and 2 CDF Data
Dataset Release Place: Space Sciences Laboratory, University of California, Berkeley
Dataset Publisher: NASA and SSL, BerkeleyOnline Resource: http://themis.ssl.berkeley.edu/roadrules.shtml
Start Date: 2007-02-18
SUN-EARTH INTERACTIONS > IONOSPHERE/MAGNETOSPHERE DYNAMICS > AURORAE
SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE FLUX > ELECTRON FLUX
SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE FLUX > ION FLUX
SUN-EARTH INTERACTIONS > SOLAR ENERGETIC PARTICLE PROPERTIES > TOTAL ELECTRON CONTENT
SUN-EARTH INTERACTIONS > IONOSPHERE/MAGNETOSPHERE DYNAMICS > ELECTRIC FIELDS/ELECTRIC CURRENTS
SUN-EARTH INTERACTIONS > IONOSPHERE/MAGNETOSPHERE DYNAMICS > MAGNETIC STORMS
ISO Topic Category
Use Constraints Please read the "Rules of the Road for Data Use" before using the data.
Data Set Progress
Distribution Media: Online (HTTP), Online (FTP)
Role: TECHNICAL CONTACT
Email: vassilis at ssl.berkeley.edu
THEMIS Mission Principal Investigator
Link to THEMIS Related Publications:
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2008-08-15
Last DIF Revision Date: 2016-11-18