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- [Text from NASA's THEMIS home page, http://www.nasa.gov/mission_pages/themis/spacecraft/EFI.html ]
The THEMIS Electric Field Instrument (EFI) is designed and built to sense the electric field in Earth's ever-changing magnetosphere. The EFI will provide the observations needed to determine the motion of the electrified gas (plasma) as it travels past each probe. This is the first time a mission will measure these motions with five probes aligned in the magnetotail. This is vital to determining the time and location of the high-speed flows that begin at substorm onset in the Earth’s magnetotail.
Group: Instrument_Details
Entry_ID: THEMIS-EFI
Group: Instrument_Identification
Instrument_Category: Solar/Space Observing Instruments
Instrument_Class: Magnetic Field/Electric Field Instruments
Short_Name: THEMIS-EFI
Long_Name: THEMIS Electric Field Instrument
End_Group
Group: Associated_Platforms
Short_Name: THEMIS
End_Group
Online_Resource: http://www.nasa.gov/mission_pages/themis/spacecraft/EFI.html
Online_Resource: http://themis.ssl.berkeley.edu/instrument_efi.shtml
Sample_Image: http://themis.ssl.berkeley.edu/images/instruments/efi.jpg
Creation_Date: 2008-07-18
Group: Instrument_Logistics
Instrument_Owner: NASA
End_Group
End_Group
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