J-GLOBAL ID:200904037045666158  Research Project code:9800036253 Update date:May. 10, 2007

Assessment of data from double-probe electric-field instrument of 'GEOTAIL'

Study period:1994 - 0
Organization (1):
Investigating Researcher (8):
Research field (1): Others
Research overview:
The double-probe method is a procedure to measure electric field by measuring difference between potentials at respective tips of paired antennas extended from a flying body. Among satellites now under operation, 'GEOTAIL' and 'Akebono' are measuring electric field by means of this method. In such a space with plasma density of some-ten particles/cc as observing region of 'Akebono', measured values can be calibrated with a relatively simple procedure because size of sheath (electron cloud) formed around the probe is sufficiently smaller than antenna length. In the space with plasma density of ca. 0.1 to 10 particles/cc such as the magnetospheric far tail that is observing region of 'GEOTAIL', the solar wind range surrounding the magnetosphere or the like, on the other hand, deviation of measured value from actual electric field largely depends on behavior of electrons that form the sheath. Study has been conducted with respect to influence of electrons in the sheath on measurement by comparing data of the double probe mounted on 'GEOTAIL' with electric field -V×B calculated from data of magnetic-field and particle instruments that are also mounted on 'GEOTAIL'.
Keywords (13):
scientific satellite ,  probe ,  electric field ,  expandable antenna ,  plasma ,  magnetosheath ,  solar wind ,  magnetosphere ,  data analysis ,  observation equipment ,  potentiometry ,  plasma density ,  magnetotail
Project Organization (1):
  • (A089001000)
Research program: Ordinary Research
Ministry with control over the research :
Ministry of Education, Culture, Sports, Science and Technology

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