Magnetic Field Observations on the Akebono (EXOS-D) Satellite

H. FUKUNISHI; R. FUJII; S. KOKUBUN; K. HAYASHI; T. TOHYAMA; Y. TONEGAWA; S. OKANO; M. SUGIURA; K. YUMOTO; I. AOYAMA; T. SAKURAI; T. SAITO; T. IIJIMA; A. NISHIDA; M. NATORI

doi:10.5636/jgg.42.385

H. FUKUNISHI, R. FUJII, S. KOKUBUN, K. HAYASHI, T. TOHYAMA, Y. TONEGAWA, S. OKANO, M. SUGIURA, K. YUMOTO, I. AOYAMA, T. SAKURAI, T. SAITO, T. IIJIMA, A. NISHIDA, M. NATORI

Author information

H. FUKUNISHI
Upper Atmosphere and Space Research Laboratory, Tohoku University
R. FUJII
National Institute of Polar Research
S. KOKUBUN
Geophysical Research Laboratory, University of Tokyo
K. HAYASHI
Geophysical Research Laboratory, University of Tokyo
T. TOHYAMA
Faculty of Engineering, Tokai University
Y. TONEGAWA
Faculty of Engineering, Tokai University
S. OKANO
Upper Atmosphere and Space Research Laboratory, Tohoku University
M. SUGIURA
Institute of Research and Development, Tokai University
K. YUMOTO
Research Institute of Atmospherics, Nagoya University
I. AOYAMA
Faculty of Engineering, Tokai University
T. SAKURAI
Faculty of Engineering, Tokai University
T. SAITO
Upper Atmosphere and Space Research Laboratory, Tohoku University
T. IIJIMA
Geophysical Research Laboratory, University of Tokyo
A. NISHIDA
Institute of Space and Astronautical Science
M. NATORI
Institute of Space and Astronautical Science

JOURNAL FREE ACCESS

1990 Volume 42 Issue 4 Pages 385-409

DOI https://doi.org/10.5636/jgg.42.385

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Abstract

The Akebono (EXOS-D) satellite carries triaxial fluxgate and search coil magnetometers with sensors mounted on 5- and 3-m masts, respectively. The fluxgate magnetometer has four automatically switchable ranges from ±1024 to ±65536nT (full scale), and resolutions commensurate with a 16-bit A/D converter in each range (0.031 to 2nT). The rate of sampling is 32 vectors per second. The triaxial search coil magnetometer has a frequency response up to 800Hz. Signals in the frequency range higher than 100Hz are used for VLF plasma wave experiments (KIMURA et al., 1990), while signals less than 100Hz are used for magnetic field experiments.
After the 3- and 5-m masts were extended on March 7 and 8, 1989, respectively, both the magnetometers are operating continuously. Intense small-scale field-aligned currents embedded in the large-scale field-aligned current system were always observed at 1-2 Re altitudes in all local time regions. The region 0 currents which flow in the poleward region adjacent to the region 1 currents were also frequently observed. The search coil magnetometer measured ion cyclotron waves at 1-2 Re altitudes near the equator.

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