The first results of the Variant experiment onboard the Sich-1M satellite

1Korepanov, VYe., 2Kryuchkov, EI, 2Lizunov, GV, 2Fedorenko, AK, 1Dudkin, FL
1L’viv Centre of the Space Research Institute of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, L’viv, Ukraine
2Space Research Institute of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, Kyiv, Ukraine
Kosm. nauka tehnol. 2007, 13 ;(4):010-017
Publication Language: Ukrainian
The Variant experiment onboard the Sich-1M satellite is an international scientific project for studying the fine structure of electric currents and electromagnetic fields in the ionospheric plasma. The Variant scientific payload includes three types of instruments for the detection of spatial electric current density, namely, split Langmuir probe, Rogovsky coil and Faraday cup as well as sensors for measurements of electric and magnetic fields, namely, electric probes, induction coil and flux-gate magnetometers. The Sich-1M satellite was launched on 24 December 2004 into the polar orbit with an inclination of 83°, an apogee of 650 km, and a perigee of 283 km. During flight tests (the first half of 2005) a set of measurement seances with the Variant payload was realized. The first results of the performed experiments are presented.
Keywords: electric probes, magnetometers, polar orbit
1. Alpert Ia. L. Waves and artificial bodies in the near-earth plasma, 214 p. (Nauka, Moscow, 1974) [in Russian].
2. Vaisberg O. L. The problem of the determination of spatial scales in the moving plasma. Kosmicheskie Issledovaniia, 23 (6), 947—949 (1985) [in Russian].
3. Vaisberg O. L., Klimov S. I., Korepanov V. E. Measurement of current density at a shock wave by a slit-type Langmuir probe. Kosmicheskie Issledovaniia, 27 (3), 461—465 (1989) [in Russian].
4. Korepanov V. E., Negoda A. A., Ivchenko V. N., et al. Space scientific experiment "Variant" on board the satellite "Sich-IM". In: 1st Ukrainian Conference for Perspective Space Researches: Proceedings, Kiev, October 8—10, 2001, 51—58 (Kiev, 2001) [in Russian].
5. Korepanov V. Ye., Ivchenko V. M., Lizunov G. V., et al. The first international scientific experiment onboard a Ukrainian satellite VARIANT. Kosm. nauka tehnol., 13 (4), 3—9 (2007) [in Ukrainian].
6. Korepanov V., Negoda O., Lizunov G., et al. Project VARIANT: Measurements of Electromagnetic Fields and Currents in the Ionospheric Plasmas Aboard the Sich-1M Satellite. Kosm. nauka tehnol., 5 (5-6), 3—8 (1999) [in Ukrainian].
7. Kriuchkov Ye. I., Lizunov G. V., Usenko P. O., Hlemba V. Yo. Systematization and preliminary processing of data from the experiment Variant onboard the Sich-1M satellite. Kosm. nauka tehnol., 13 (4), 18—24 (2007) [in Ukrainian].
8. Molchanov O. A. Low-frequency waves and induced radiation in the near-Earth plasma, 224 p. (Nauka, Moscow, 1985) [in Russian].
9. Bering E. A., Kelley M. C., Mozer F. S., Fahleson U. V. Theory and operation of the Split Langmuir Probe. Planet. Space Sci., 21 (11), P. 1983 (1973).
10. Korepanov V., Dudkin F. Comparative analysis of current density meters operating in space plasma. Adv. Space Res., 23 (8), 1541 —1544 (1999).
11. Krasnosel'skikh V., Natanzon A., Reznikov A., et al. Current Measurements in Space Plasmas and the Problem of Separating between Spatial and Temporal Variations in the Field of a Plane Electromagnetic Wave. Adv. Space Res., 11 (9), 37—40 (1991).

12. Santolik O., Parrot M. Propagation analysis of electromagnetic waves between helium and proton gyrofrequencies in the low-altitude auroral zone. J. Geophys. Res., 103 (A9), 20469—20480 (1998).