지상지자기변화기록을 이용한 우주천기연구

안병호 한국천문학회 2000 天文學論叢 Vol.15 No.3

Through the coupling between the near-earth space environment and the polar ionosphere via geomagnetic field lines, the variations occurred in the magnetosphere are transferred to the polar region. According to recent studies, however, the polar ionosphere reacts not only passively to such variations, but also plays active roles in modifying the near-earth space environment. So the study of the polar ionosphere in terms of geomagnetic disturbance becomes one of the major elements in space weather research. Although it is an indirect method, ground magnetic disturbance data can be used in estimating the ionospheric current distribution. By employing a realistic ionospheric conductivity model, it is further possible to obtain the distributions of electric potential, field-aligned current, Joule heating rate and energy injection rate associated with precipitating auroral particles and their energy spectra in a global scale with a high time resolution. Considering that the ground magnetic disturbances are recorded simultaneously over the entire polar region wherever magnetic station is located, we are able to separate temporal disturbances from spatial ones. On the other hand, satellite measurements are indispensible in the space weather research, since they provide us with in situ measurements. Unfortunately it is not easy to separate temporal variations from spatial ones specifically measured by a single satellite. To demonstrate the usefulness of ground magnetic disturbance data in space weather research, various ionospheric quantities are calculated through the KRM method, one of the magneto gram inversion methods. In particular, we attempt to show how these quantities depend on the ionospheric conductivity model employed.

㈜도화종합기술공사 상하수도부

안병호 대한토목학회 1999 대한토목학회지 Vol.47 No.12

지자기교란시 극전리층의 전자기적인 특성

안병호 한국우주과학회 1995 Journal of Astronomy and Space Sciences Vol.12 No.2

오로라제트전류대의 계절, 태양주기 및 세계시에 따른 변화

안병호 한국우주과학회 2002 한국우주과학회보 Vol.11 No.2

지상지자기변화기록을 이용한 우주천기연구

안병호,AHN BYUNG-HO 한국천문학회 2000 天文學論叢 Vol.15 No.suppl2

Through the coupling between the near-earth space environment and the polar ionosphere via geomagnetic field lines, the variations occurred in the magnetosphere are transferred to the polar region. According to recent studies, however, the polar ionosphere reacts not only passively to such variations, but also plays active roles in modifying the near-earth space environment. So the study of the polar ionosphere in terms of geomagnetic disturbance becomes one of the major elements in space weather research. Although it is an indirect method, ground magnetic disturbance data can be used in estimating the ionospheric current distribution. By employing a realistic ionospheric conductivity model, it is further possible to obtain the distributions of electric potential, field-aligned current, Joule heating rate and energy injection rate associated with precipitating auroral particles and their energy spectra in a global scale with a high time resolution. Considering that the ground magnetic disturbances are recorded simultaneously over the entire polar region wherever magnetic station is located, we are able to separate temporal disturbances from spatial ones. On the other hand, satellite measurements are indispensible in the space weather research, since they provide us with in situ measurements. Unfortunately it is not easy to separate temporal variations from spatial ones specifically measured by a single satellite. To demonstrate the usefulness of ground magnetic disturbance data in space weather research, various ionospheric quantities are calculated through the KRM method, one of the magneto gram inversion methods. In particular, we attempt to show how these quantities depend on the ionospheric conductivity model employed.

대리송수신자 개념을 이용한 신뢰성 있는 멀티캐스트 전송기법

안병호,조국현,An, Byeong-Ho,Jo, Guk-Hyeon 한국정보처리학회 1999 정보처리논문지 Vol.6 No.2

A Multicast transfer is a critical delivery method to provide a transport service to multipeer applications, the various problems on the multicast transfer environments have been occurred from the results of current research. One of these problems is the multicast transport service issue to guarantee reliability and scalability. First, this paper presents the related research of the reliable multicast transport methods, and then proposes a new transfer architecture using the Agent Sender and Receiver Concept(ASRC) to solve a reliable multicast transfer issue. we also propose a method to apply the proposed architecture(ASRC) to the well-known sender-initiated and receiver-initiated transport protocol. In order 새 validate the proposed ASRC architecture, t도 applied sender and receiver system si compared and analyzed over the processing requirement and maximum throughput.

主題發表 (주제발표) (4) : 지구환경(地球環境) 연구(硏究)의 새로운 방향(方向)

안병호 경북대학교 과학교육연구소 1993 科學敎育硏究誌 Vol.17 No.-

학술 발표 논문 초록 / 지구과학내용분야 2 / 우주천기예보의 현황과 전망

안병호 한국지구과학회 2000 지구과학 교육심포지엄 및 춘계학술발표회 Vol.2000 No.-

자기권 서브스톰 확장기의 극전리층의 전자기적 특성

安炳鎬 경북대학교 과학교육연구소 1993 科學敎育硏究誌 Vol.17 No.-

Vatious electodynamic quantities in the polar ionosphere during the early phase of the magnetospheric substorm which occurred at 1850 UT on April 1, 1986 are estimated through the KRM method (Kamide et al., 1981). The ground magnetometer data from a total of 75 norhern hemisphere stations and the ionospheric conductivity distribution inferred from simultaneous auroral images taken from the Viking satellite (Robinson et al., 1989) are utilized. Since the Scandinavian and Russian chains of magnetometers were located in and near the midnight the Scandinavian and Russian chains of magnetometers were located in and near the midnight sector during this time interval and the inferred conductivity distribution was an instantaneous one, it provides us a unique opportunity to examine some longstanding ambiguities associated with spatial and temporal variations of substorm electrodynamic parameters over the midnight sector. Several important results obtained from this study are summarized as follows: (1) During the growth phase of the substorm no appreciable intensification of either ionospheric current or electric field is noticed. Both quantities began to increase only with the initiation of the substorm expansion phase. (2) During the expansion phase the enhanced electric field seems to play as important role as enhanced conductivity does in intensifying the DP-1 current system. (3) The global Joule and particle heating rates are very small and quite comparable with each other until the onset. But the former shows a marked intensification while the latter increases moderately during the expansion phase of the substorm, indicating that the Joule heating is more effective than particle heating in dissipating the solar wind-magnetosphere coupling energy over the auroral latitudes.

雙曲線軌道를 運行하는 星團의 潮汐에너지 獲得(Ⅱ)

安炳鎬,金敬益 慶北大學校 1978 論文集 Vol.25-26 No.-

Tidal energy gains of a star cluster moving along various orbits around the galaxy were examined by many authors. In this paper, we derive the expression for the tidal energy gain taking account of the effects of a two- body orbit and internal motion of the cluster. (ⅰ) We show that the expression obtained for the gain of internal energy of a star cluster on the assumption of impulsive approximation does not differ from that obtained by Spitzer for the uniform rectilinear motion within a factor of 2. (ⅱ) We derive the expression for the tidal energy gain of a star cluster more explicitly in the case of slow encounter.