• Title/Summary/Keyword: space storm

Search Result 7, Processing Time 0.058 seconds

Development of High Energy Particle Detector for the Study of Space Radiation Storm

  • Jo, Gyeong-Bok;Sohn, Jongdae;Choi, Cheong Rim;Yi, Yu;Min, Kyoung-Wook;Kang, Suk-Bin;Na, Go Woon;Shin, Goo-Hwan
    • Journal of Astronomy and Space Sciences
    • /
    • v.31 no.3
    • /
    • pp.277-283
    • /
    • 2014
  • Next Generation Small Satellite-1 (NEXTSat-1) is scheduled to launch in 2017 and Instruments for the Study of Space Storm (ISSS) is planned to be onboard the NEXTSat-1. High Energy Particle Detector (HEPD) is one of the equipment comprising ISSS and the main objective of HEPD is to measure the high energy particles streaming into the Earth radiation belt during the event of a space storm, especially, electrons and protons, to obtain the flux information of those particles. For the design of HEPD, the Geometrical Factor was calculated to be 0.05 to be consistent with the targets of measurement and the structure of telescope with field of view of $33.4^{\circ}$ was designed using this factor. In order to decide the thickness of the detector sensor and the classification of the detection channels, a simulation was performed using GEANT4. Based on the simulation results, two silicon detectors with 1 mm thickness were selected and the aluminum foil of 0.05 mm is placed right in front of the silicon detectors to shield low energy particles. The detection channels are divided into an electron channel and two proton channels based on the measured LET of the particle. If the measured LET is less than 0.8 MeV, the particle belongs to the electron channel, otherwise it belongs to proton channels. HEPD is installed in the direction of $0^{\circ}$, $45^{\circ}$, $90^{\circ}$ against the along-track of a satellite to enable the efficient measurement of high energy particles. HEPD detects electrons with the energy of 0.1 MeV to several MeV and protons with the energy of more than a few MeV. Thus, the study on the dynamic mechanism of these particles in the Earth radiation belt will be performed.

A Design of Solar Proton Telescope for Next Generation Small Satellite

  • Sohn, Jongdae;Oh, Suyeon;Yi, Yu;Min, Kyoung-Wook;Lee, Dae-Young;Seon, Jongho
    • Journal of Astronomy and Space Sciences
    • /
    • v.29 no.4
    • /
    • pp.343-349
    • /
    • 2012
  • The solar proton telescope (SPT) is considered as one of the scientific instruments to be installed in instruments for the study of space storm (ISSS) which is determined for next generation small satellite-1 (NEXTSat-1). The SPT is the instrument that acquires the information on energetic particles, especially the energy and flux of proton, according to the solar activity in the space radiation environment. We performed the simulation to determine the specification of the SPT using geometry and tracking 4 (GEANT4). The simulation was performed in the range of 0.6-1,000 MeV considering that the proton, which is to be detected, corresponds to the high energy region according to the solar activity in the space radiation environment. By using aluminum as a blocking material and adjusting the energy detection range, we determined total 7 channels (0.6~5, 5~10, 10~20, 20~35, 35~52, 52~72, and >72 MeV) for the energy range of SPT. In the SPT, the proton energy was distinguished using linear energy transfer to compare with or discriminate from relativistic electron for the channels P1-P3 which are the range of less than 20 MeV, and above those channels, the energy was determined on the basis of whether silicon semiconductor detector (SSD) signal can pass or not. To determine the optimal channel, we performed the conceptual design of payload which uses the SSD. The designed SPT will improve the understanding on the capture and decline of solar energetic particles at the radiation belt by measuring the energetic proton.

An Implementation of the Disaster Management Systems on the Space and Terrestrial System Damages by Solar Maximum (태양폭풍 영향 우주 및 육상시스템 피해에 관한 재난안전정보시스템 구현)

  • Oh, Jongwoo
    • Journal of the Society of Disaster Information
    • /
    • v.8 no.4
    • /
    • pp.419-431
    • /
    • 2012
  • This paper takes precautions proposals against prospective disasters from the space weather maximum in 2013. A geomagnetic space storm sparked by a solar maximum like the one that flared toward earth is bound to strike again and could wreak havoc across the modern world. The purpose of the study is that the disaster reduction and safety service implementation study on the ultimate space weather systems by the information systems of the space weather. The process methods of the study are that an implementation of preparation for the smart IT and GIS based disaster management systems of the solar maximum deal with analysis on the flare, solar proton event, and geomagnetic storm from space blasters, These approach and methods for the solar maximin display national policy implementation of the pattern of the radio wave disasters from the protection and preparation methods. This research can provide affective methods for the saving lives and property protections that implementation of the disaster prediction and disaster prevention systems adapts the smart IT systems and converged decision making support systems using uGIS methodology.

Initial Operation and Preliminary Results of the Instrument for the Study of Stable/Storm-Time Space (ISSS) on Board the Next Generation Small Satellite-1 (NEXTSat-1)

  • Kim, Eojin;Yoo, Ji-Hyeon;Kim, Hee-Eun;Seo, Hoonkyu;Ryu, Kwangsun;Sohn, Jongdae;Lee, Junchan;Seon, Jongho;Lee, Ensang;Lee, Dae-Young;Min, Kyoungwook;Kang, Kyung-In;Lee, Sang-Yun;Kang, Juneseok
    • Journal of Astronomy and Space Sciences
    • /
    • v.37 no.3
    • /
    • pp.209-218
    • /
    • 2020
  • This paper describes the initial operations and preliminary results of the Instrument for the study of Stable/Storm-time Space (ISSS) onboard the microsatellite Next Generation Small Satellite-1 (NEXTSat-1), which was launched on December 4, 2018 into a sun-synchronous orbit at an altitude of 575 km with an orbital inclination angle of 97.7°. The spacecraft and the instruments have been working normally, and the results from the observations are in agreement with those from other satellites. Nevertheless, improvement in both the spacecraft/instrument operation and the analysis is suggested to produce more fruitful scientific results from the satellite operations. It is expected that the ISSS observations will become the main mission of the NEXTSat-1 at the end of 2020, when the technological experiments and astronomical observations terminate after two years of operation.

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
    • Journal of Astronomy and Space Sciences
    • /
    • v.31 no.1
    • /
    • pp.73-81
    • /
    • 2014
  • 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.

Precautionary Principle for the Protection of Space Environment against Solar Electromagnetic Storm (우주전파재난과 우주법상의 사전주의 원칙에 관한 연구)

  • Shin, Hong-Kyun
    • The Korean Journal of Air & Space Law and Policy
    • /
    • v.26 no.1
    • /
    • pp.241-269
    • /
    • 2011
  • Solar flare and storm may give an adverse effect upon electromagnetic environment around the Earth, so that various kinds of satellite cease to normally function. This kind of space storm disaster is characterized by the uncertainty about when and what size. Recently the UN has been paying attention to this plausible disaster. Particularly the COPUOS has taken the view that this disaster would threaten the sustainable space environment. The precautionary principle, rooted and excercised in the environment protection filed, has been adopted in the case of disaster with uncertainty. The reports and opinions given by the expert and representatives of the member States have stated that the precautionary principle should be adopted for the purpose of dealing with this disaster. On the other hand, it is advanced that the principle has been already included in the space law principle enshrined in the 1967 Space Treaty. The Treaty has adopted the freedom of navigation and use of the outer space for the interest of all States as the basic principles. Sustainable environment is necessary for implementing the principle. Therefore, the rules for the protection of sustainable space environment should be based upon the space law principle.

  • PDF

A Study of the Disaster Safety Management Systems on the Satellite Communication Networks for Solar Maximum (태양극대기 대비 위성통신망에 관한 재난안전관리시스템에 관한 연구)

  • Oh, Jongwoo
    • Journal of Satellite, Information and Communications
    • /
    • v.7 no.3
    • /
    • pp.78-85
    • /
    • 2012
  • This paper takes precautions proposals against prospective disasters from the space weather maximum in 2013. The space weather maximum could wreak havoc in this world. A geomagnetic space storm sparked by a solar eruption like the one that flared toward earth is bound to strike again and could wreak havoc across the modern world. Despite of the fact that not only researches by colleges and institutions current researches have been focusing on warning systems of space communication and the earth network systems, but also management and control systems are not situated for the space weather blasters. The purpose of the study is that the damage reduces methods implementation on the ultimate space weather communication systems by above lists proposed type analysis. In result, the implementation of the communication disaster management systems deals with the smart IT converged GIS analysis on the flare, solar proton event, geomagnetic storm to the effects of the geomagneticsphere, ionosphere and troposphere from solar maximum. This research can provide affective methods for the saving lives and property protections that implementation of the disaster prediction and disaster prevention systems adapts smart IT systems and converged high tech information systems using decision making support systems of the GIS methodology.