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Forbush Decreases Observed by the LRO/CRaTER
손종대,오수연,이유,김어진,이주희,Sohn, Jongdae,Oh, Suyeon,Yi, Yu,Kim, Eojin,Lee, Joo-Hee,Spence, Harlan E. 한국천문학회 2012 天文學會報 Vol.37 No.2
The Lunar Reconnaissance Orbiter (LRO) launched on June 16, 2009 has six experiments including of the Cosmic Ray Telescope for the Effects of Radiation (CRaTER) onboard. The CRaTER instrument characterizes the radiation environment to be experienced by humans during future lunar missions. The CRaTER instrument measures the effects of ionizing energy loss in matter specifically in silicon solid-state detectors due to penetrating solar energetic protons (SEP) and galactic cosmic rays (GCRs) after interactions with tissue-equivalent plastic (TEP), a synthetic analog of human tissue. The CRaTER instrument houses a compact and highly precise microdosimeter. It measures dose rates below one micro-Rad/sec in silicon in lunar radiation environment. Forbush decrease (FD) event is the sudden decrease of GCR flux. We use the data of cosmic ray and dose rates observed by the CRaTER instrument. We also use the CME list of STEREO SECCHI inner, outer coronagraph and the interplanetary CME data of the ACE/MAG instrument.We examine the origins and the characteristics of the FD-like events in lunar radiation environment. We also compare these events with the FD events on the Earth. We find that whenever the FD events are recorded at ground Neutron Monitor stations, the FD-like events also occur on the lunar environments. The flux variation amplitude of FD-like events on the Moon is approximately two times larger than that of FD events on the Earth. We compare time profiles of GCR flux with of the dose rate of FD-like events in the lunar environment. We figure out that the distinct FD-like events correspond to dose rate events in the CRaTER on lunar environment during the event period.
Construction of the image database of Earth's lava caves useful in identifying the lunar caves
홍익선,정종일,손종대,오수연,이유,Hong, Ik-Seon,Jeong, Jongil,Sohn, Jongdae,Oh, Suyeon,Yi, Yu 한국천문학회 2012 天文學會報 Vol.37 No.2
Cave on the Moon is considered as the most appropriate place for human to live during the frontier lunar exploration. While the lava flows, the outer crust gets cooled and solidified. Then, the empty space is remained inside after lava flow stops. Such empty space is called the lava caves. Those lava tubes on the Earth are formed mostly by volcanic activity. However, the lava tubes on satellite like Moon and planet like Mars without volcanic activity are mostly formed by the lava flow inside of the crater made by large meteorite impact. Some part of lava tube with collapsed ceiling appears as the entrance of the cave. Such area looks like a deep crater so called a pit crater. Four large pit craters with diameter of > 60 m and depth of > 40 m are found without difficulty from Kaguya and LRO mission image archives. However, those are too deep to use as easily accessible human frontier base. Therefore, now we are going to identify some smaller lunar caves with accessible entrances using LRO camera images of 0.5 m/pixel resolution. Earth's lava caves and their entrances are well photographed by surface and aerial camera in immense volume. Thus, if the image data are sorted and archived well, those images can be used in comparison with the less distinct lunar cave and entrance images due to its smaller size. Then, we can identify the regions on the Moon where there exist caves with accessible entrances. The database will be also useful in modeling geomorphology for lunar and Martian caves for future artificial intelligence investigation of the caves in any size.
20 ~ 400 keV 에너지 대역의 중 에너지 입자 검출기의 신호 처리 연구
설우형(Woohyeong Seol),서용명(Yongmyung Seo),우주(Ju Woo),이채안(Chaean Lee),이찬행(Chanhaeng Lee),선종호(Jongho Seon),손종대(Jongdae Sohn),민경욱(Kyoungwook Min),강경인(Kyungin Kang),신구환(Goohwan Shin),채장수(Jangsoo Chae) 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4
경희대학교가 개발중인 중 에너지 입자 검출기(Medium Energy Particle Detector, MEPD)는 한국과학기술원 인공위성연구센터가 개발 중인 차세대 소형 위성 1호(Next Generation Small Satellite-1, NEXTSat-1)의 탑재체중 하나이다. 본 검출기는 20 ~ 400 keV 에너지 대역의 전자, 양성자, 중성 입자를 검출 가능하다. 해당 검출기는 저 에너지 영역 관측에 유리한 실리콘 검출기(Silicon Solid State Detector, SSSD)를 도입하였다. SSSD는 방사선 입자가 입사시 미약한 신호가 발생하고, 이 미약한 신호를 신호 처리 회로를 통해 바꿔준다. 본 탑재체는 SSSD에서 최초 발생하는 미약한 신호를 다루기 때문에 해당 검출기의 효율과 검출기에서 발생하는 신호를 디지털화 시켜주기 위한 신호 처리 회로가 중요하다. Front-end electronics of Medium Energy Particle Detector (MEPD) in the range of 20 ~ 400 keV is developed to detect electrons, protons, and neutral with 6.25 keV resolution. To achieve the desired range and resolutions, MEPD adopts a solid state silicon detector with corresponding stopping power which is energy loss of charged particles due to interaction with matter. The incident particles will produce primitive signals by creating electron-hole pairs those are proportional to the incident energy and subsequently collected by charge sensitive preamplifier. The output of the preamplifier is connected to a unipolar shaping amplifier which produces quasi-Gaussian shape pulse. The MEPD is one of a subset instrument within the Instrument for the Study of Space Strom (ISSS) to measure space storms in the mission orbit of Next Generation Small Satellite-1 (NEXTSat-1) scheduled for launch in 2017.
태양동기궤도 우주 방사선 환경 연구를 위한 20~400 keV 에너지 대역의 전자, 양성자 및 중성입자 검출기
서용명(Yongmyung Seo),윤세영(Seyoung Yoon),우주(Ju Woo),설우형(Woohyung Seol),이채안(Chaean Lee),선종호(Jongho Seon),손종대(Jongdae Sohn),민경욱(Kyoungwook Min),강경인(Kyungin Kang),신구환(Goohwan Shin),채장수(Jangsoo Chae) 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.11
지자기 폭풍 연구를 위한 20~400 keV 대역의 플라즈마 입자 검출기
서용명(Yongmyung Seo),윤세영(Seyoung Yoon),우주(Ju Woo),설우형(Woohyung Seol),이채안(Chaean Lee),이찬행(Chanhaeng Lee),선종호(Jongho Seon),손종대(Jongdae Sohn),민경욱(Kyoungwook Min),강경인(Kyungin Kang),신구환(Goohwan Shin),채장수(Jan 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4
경희대학교가 제작한 중에너지 입자 검출기(Medium Energy Particle Detector, MEPD)는 우주폭풍 연구에 필요한 물리량 획득을 위한 과학 탑재체(Instrument for the Study of Space Strom, ISSS)중 20~400 keV 대역의 전자, 양성자 및 중성 입자를 6.25 keV 와 1 sec ~ 10 msec의 에너지 및 시간 분해능으로 검출한다. 본 검출기는 지자기 폭풍 발생 시 급격히 증가하는 대전 입자들을 정전 편향기(electrostatic deflector)와 감쇄기가 적용된 망원경 2대의 수직 배치를 통하여, 데이터 오염과 전장부 포화를 방지하고 예상되는pitch angle에 따라 입자의 종류 및 에너지를 구분 검출 하도록 제작 되었다. 해당 탑재체의 위성 본체는 한국과학기술원 인공위성연구센터가 개발 중인 차세대 소형위성 1호 (Next Generation Small Satellite-1, NEXTSat-1) 이며, 2017년 발사 예정이다. Measurement of energies and fluxes for the charged particles and neutral is required for research of space storms. The measurement requires a careful calibration of the instrument to detect significantly varying fluxes of those particles relative to the occurrence of geomagnetic storms without saturation or loss of information on the mission orbit. The Medium Energy Particle Detector (MEPD) will have an energy range from 20~400 keV and resolution 6.25 keV with orthogonal field-of-views of two telescopes for the detection of charged particles in terms of different pitch angles. The MEPD is one of a subset instrument within the Instrument for the Study of Space Strom (ISSS) which contains both space radiation detectors and space plasma instruments. The ISSS is developed to measure space storms in low altitude polar orbits and will be aboard the Next Generation Small Satellite-1 (NEXTSat-1) scheduled for launch in 2017.
우주폭풍연구를 위한 중 에너지 입자검출기의 표준화 과정
이찬행(Chanhaeng Lee),윤세영(Seyoung Yoon),우주(Ju Woo),설우형(Woohyung Seol),이채안(Chaean Lee),서용명(Yongmyung Seo),선종호(Jongho Seon),손종대(Jongdae Sohn),민경욱(Kyoungwook Min),강경인(Kyungin Kang),신구환(Goohwan Shin),채장수(Jan 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4
경희대학교에서 개발하는 Medium Energy Particle Detector (MEPD)는 우주폭풍연구를 위한 과학 탑재체의 구성으로써 중 에너지 우주 방사선을 검출하는 역할을 담당한다. 본 입자검출기는 20~400 keV 의 에너지 대역에서 플라즈마 입자를 검출한다. 본 연구에서는 표준화되어 있지 않은 각 입자검출기의 에너지-채널 관계를 표준 방사선원의 잘 알려진 방출에너지 값을 이용하여 표준화 하였다. 이를 통해 각 검출기는 시작점과 간격이 동일한 데이터를 생산한다. 본 연구의 주 내용은 검출기 데이터 표준화를 위한 Look Up Table 수정 방법이며 표준화 작업이 완료된 검출기로 측정한 데이터를 결과로써 제시한다. The Medium Energy Particle Detector (MEPD) is one of the subset detectors which are in the Instrument for the Study of Space Storms (ISSS). This particle detector measures the electrons, protons and neutral particles whose energy range is from 20 keV to 400 keV. In this study, we calibrated the correlation of energy with channel by using the peak energies emitted from the well-known radionuclide. The main topic of this research is to manipulate the correspondence between the signal pulse heights digitized by the ADC and energy channels by adopting programmable Look-Up Table (LUT). We make the data have equal offsets and energy scales through iterative modification. Finally, the radionuclide spectrums which are calibrated are provided as a result of this study.
Open New Horizon with L4 Mission: Vision and Planning
Kyung-Suk Cho(조경석),Junga Hwang(황정아),Jeong-Yeol Han(한정열),Seonghwan Choi(최성환),Eun-Kyung Lim(임은경),Jungjoon Seough(서정준),Rok-Soon Kim(김록순),Sung-Hong Park(박성홍),Jongdae Sohn(손종대),Jie-Hae Back(백지혜),Young-Jae 한국항공우주학회 2023 한국항공우주학회 학술발표회 논문집 Vol.2023 No.6