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Explorer 52 was a US satellite launched on June 3, 1974 from Vandenberg Air Force Base on a Scout booster. This satellite was also known as: * Hawkeye 1 * IE D * Injun 6 * Injun F * Neutral Point Explorer * 07325 ==Mission== The primary mission objective of Hawkeye 1 (Explorer 52) was to conduct particles and fields investigations of the polar magnetosphere of the earth out to 21 earth radii. Secondary objectives were to make magnetic field and plasma distribution measurements in the solar wind, and to study Type-3 radio emissions caused by solar electron streams in the interplanetary medium. To accomplish these objectives, the spacecraft was instrumented with following instruments: * a plasma wave receiver,〔http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1974-040A-03 ELF/VLF Receivers〕 * a fluxgate magnetometer,〔http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1974-040A-01 Triaxial Fluxgate Magnetometer〕 and * a low energy proton-electron differential energy analyzer.〔http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1974-040A-02 Low-Energy Protons and Electrons〕 The spacecraft was spin stabilized with a nominal rotational period of 11 s. In celestial coordinates, the positive spin axis coordinates were right ascension 299.4 deg (plus or minus 1.1 deg) and declination 8.6 deg (plus or minus 1.5 deg). There was no onboard orientation or spin rate control, but the orientation of the spin axis was stable. An optical aspect system operated from launch until September 3, 1974. After this period, aspect had to be determined from magnetometer measurements. The complete spacecraft with instruments had a mass of . Power of 22 to 36 W, depending on solar aspect, was obtained from solar cells. Hawkeye 1 participated in the International Magnetospheric Study (IMS) and during the first half of 1977 data acquisition was confined to IMS special intervals. Data were obtained in real time only, at frequencies of 136 and 400 MHz at 100 bit/s (or 200 bit/s with convolutional coding) plus wideband VLF data. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Explorer 52」の詳細全文を読む スポンサード リンク
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