Simultaneous observation of geomagnetic sudden commencement above and below the ionosphere

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概要

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• A geomagnetic sudden commencement (SC) was observed by the low altitude geomagnetic satellite, MAGSAT, when it was flying very closely above a ground station (Magadan in east Siberia, geomagnetic latitude=51.1°) in a duskside (16-17h LT) meridian. The H-component at the satellite showed a positive pulse of 52nT and the D-component a negative pulse of 43nT in the beginning part of the SC. The duration of the pulse was 2-3min. The SC observed by normal-run magnetographs at Magadan and other ground stations near the satellite orbit was preceded by a typical preliminary impulse (PI) of which sense is opposite to that of the pulse observed by MAGSAT. By the use of high time resolution data from the IMS magnetometer network Alaska chain, the pulse detected by MAGSAT was identified with the PI observed at the ground stations. It was concluded that the main source current for the PI flowed between the satellite and the ground, that is, in the ionosphere, but effects of other source currents including field aligned currents should be taken into account.

• 国立極地研究所の論文

著者

• IYEMORI Toshihiko

  Data Analysis Center for Geomagnetism and Space Magnetism, Garaduate School of Science, Kyoto Univer

• Araki T

  Data Analysis Center For Geomagnetism And Spacemagnetism Faculty Of Science Kyoto University

• Araki T

  Department Of Geophysics Faculty Of Science Kyoto University

• Araki Tohru

  Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University

• Kamei Toyohisa

  Dataanalysis Center For Geomagnetism And Space Magnetism Kyoto University

• Iyemori Toshihiko

  DataAnalysis Center for Geomagnetism and Space Magnetism, Kyoto University

• Kamei Toyohisa

  Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University

• Ikeda Tatsuya

  Data Analysis Center For Geomagnetism And Spacemagnetism Faculty Of Science Kyoto University

• Kamei Toyohisa

  Data Analysis Center For Geomagnetism And Space Magnetism Kyoto University

• Iyemori T

  Kyoto Univ. Kyoto Jpn

• Iyemori Toshihiko

  Data Analysis Center For Geomagnetism And Space Magnetism Garaduate School Of Science Kyoto Universi

関連論文

• Local time dependence of the dominant frequency of Pi2 pulsations at mid-and low-latitudes
• Characteristics of CNA associated with geomagnetic sudden commencements
• Geomagnetic sudden commencements observed at the Syowa-Iceland conjugate stations
• Characteristics of polarization of geomagnetic sudden commencements observed at Syowa Station
• Characteristics of polarization of geomagnetic sudden commencements at geostationary orbit
• Structure of large amplitude abrupt magnetic variations observed by the MAGSAT
• Characteristics of small-scale magnetic fluctuations over the high-latitude ionosphere
• Derivation of polar cap AE indices
• Simultaneous observation of geomagnetic sudden commencement above and below the ionosphere
• Characteristics of solar flare effect in the high-latitude ionosphere as observed by the SuperDARN radars
• A Symmetric Appearance of Pc5 on Dawn and Dusk Sides Associated with Solar Wind Pressure Enhancement
• Scandinavian IMS magnetometer array data and their use for studies ofgeomagnetic rapid variations
• Conjugacy of rapid motions and small-scale deformations of discrete auroras by all-sky TV observations
• Diurnal phase and amplitude variations of 12.1 kHz Omega signal along the auroral zone
• Phase and amplitude of VLF Omega signals observed simultaneously at three stations in Iceland in association with magnetospheric substorms
• A case study of VLF phase and amplitude variation at 12.1 kHz (Aldra) in Iceland
• Local time dependence of the frequency of Pi2 waves simultaneously observed at 5 low-latitude stations
• Local time features of geomagnetic jerks
• Characteristics of the association between an SC and a substorm onset
• Correlations of AKR index with Kp and Dst indices
• Scale-length dependence of the ratio between the magnetic and electric field perturbations in the ionospheric field-aligned current region
• A statistical study of ULF waves observed by MAGSAT at ionospheric altitude

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