Scientific Missions and Technologies of the ISSS on board the NEXTSat-1

  • Choi, Cheong Rim ;
  • Sohn, Jongdae ;
  • Lee, Jun-Chan ;
  • Seo, Yong Myung ;
  • Kang, Suk-Bin ;
  • Ham, Jongwook ;
  • Min, Kyoung-Wook ;
  • Seon, Jongho ;
  • Yi, Yu ;
  • Chae, Jang-Soo ;
  • Shin, Goo-Hwan
  • Received : 2013.12.30
  • Accepted : 2014.01.14
  • Published : 2014.03.15


A package of space science instruments, dubbed the Instruments for the Study of Space Storms (ISSS), is proposed for the Next Generation Small Satellite-1 (NEXTSat-1), which is scheduled for launch in May 2016. This paper describes the instrument designs and science missions of the ISSS. The ISSS configuration in NEXTSat-1 is as follows: the space radiation monitoring instruments consist of medium energy particle detector (MEPD) and high energy particle detector (HEPD); the space plasma instruments consist of a Langmuir probe (LP), a retarding potential analyzer (RPA), and an ion drift meter (IDM). The space radiation monitoring instruments (MEPD and HEPD) measure electrons and protons in parallel and perpendicular directions to the geomagnetic field in the sub-auroral region, and they have a minimum time resolution of 50 msec for locating the region of the particle interactions with whistler mode waves and electromagnetic ion cyclotron (EMIC) waves. The MEPD measures electrons and protons with energies of tens of keV to ~400 keV, and the HEPD measures electrons with energies of ~100 keV to > ~1 MeV and protons with energies of ~10 MeV. The space plasma instruments (LP, RPA, and IDM) observe irregularities in the low altitude ionosphere, and the results will be compared with the scintillations of the GPS signals. In particular, the LP is designed to have a sampling rate of 50 Hz in order to detect these small-scale irregularities.


space storm;space radiation measurement;space plasma observation;instruments for the study of space storms (ISSS)


  1. Elkington SR, Hudson MK, Chan AA, Resonant acceleration and diffusion of outer zone electrons in an asymmetric geomagnetic field, JGR, 108, A3, 1116 (2003).
  2. Kil H, Paxton LJ, Kim KH, Park S, Zhang Y, et al., Temporal and spatial components in the storm-time ionospheric disturbances, JGR, 116, A11315 (2011).
  3. Kil H, Paxton LJ, Pi X, Hairston MR, Zhang Y, Case study of the 15 July 2000 magnetic storm effects on the ionosphere-driver of the positive ionospheric storm in the winter hemisphere, JGR, 108, A11, 1391 (2003).
  4. Li X, Baker DN, Temerin M, Cayton TE, Reeves GD, et al., Multisatellite observations of the outer zone electron variation during the November 3-4, 1993, magnetic storm, JGR, 102, A7, 14123-14140 (1997).
  5. Lampton M, Daytime observations of energetic auroral-zone electrons, JGR, 72, 5817-5823 (1967).
  6. Le H, Liu JY, Liu L, A statistical analysis of ionospheric anomalies before 736 M6.0+ earthquakes during 2002-2010, JGR, 116, A02303 (2011).
  7. Lee JJ, Parks GK, Min KW, Kim HJ, Park J, et al., Energy spectra of 170-360 keV electron microbursts measured by the Korean STSAT-1, GRL, 32, L13106 (2005).
  8. Lorentzen KR, Blake JB, Inan US, Bortnik J, Observations of relativistic electron microbursts in association with VLF chorus, JGR, 106 (A4), 6017-6027 (2001).
  9. Millan RM, Lin RP, Smith DM, Lorentzen KR, McCarthy MP, X-ray observations of MeV electron precipitation with a balloon-borne germanium spectrometer, GRL, 29, 2194 (2002).
  10. Rao NN, Yeh KC, Comparison of Faraday and Doppler methods of obtaining ionospheric electron content, JGR, 73, 2447-2458 (1968).
  11. Schimmerling W, Curtis SB, Workshop on the radiation environment of the satellite power system (Department of Energy Lawrence Berkeley Laboratory, Berkeley, 1978).
  12. Xiong F, Liao AD, Estrada D, Pop E, Low-Power Switching of Phase-Change Materials with Carbon Nanotube Electrodes, Science, 332, 568-570 (2011).
  13. Sohn JD, Oh SY, Yi Y, Min KW, Lee DY, et al., A Design of Solar Proton Telescope for Next Generation Small Satellite, JASS, 29, 343-349 (2012).
  14. Su SY, Yeh HC, Chao CK, Heelis RA, Observation of a large density dropout across the magnetic field at 600 km altitude during the 6-7 April 2000 magnetic storm, JGR, 107, A11, 1404 (2002).
  15. Summers D, Thorne RM, Xiao F, Relativistic theory of wave-particle resonant diffusion with application to electron acceleration in the magnetosphere, JGR, 103, A9, 20487-20500 (1998).

Cited by

  1. Pitch-angle diffusion of electrons through growing and propagating along a magnetic field electromagnetic wave in Earth's radiation belts vol.22, pp.6, 2015,
  2. Development of High Energy Particle Detector for the Study of Space Radiation Storm vol.31, pp.3, 2014,


Supported by : National Research Foundation of Korea