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By Robert F. Pfaff, Joseph E. Borovsky, David T. Young

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Published via the yank Geophysical Union as a part of the Geophysical Monograph Series.

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Gurnett,andI. H. , 5, 1049, 1970. in the Spacelab2 plasmawave data: Obliqueelectrostatic Mott-Smith,H. , andI. Langmuir,The theoryof collectors in wavesgenerated by the electronbeam, J. Geophys. ,97, 17,005, 1992. , 28, 727, 1926. Gussenhoven, M. , D. A. Hardy,F. Rich, W. J. , C. A. -G. F H{a}lthammar, V. -C. -A. Lindqvist, F. Mozer, and R. Totbert, polar auroral environment, J. , 90, 11,009, Quasistaticelectricfield measurements with sphericaldouble 1985. probeson the GEOS and ISEE satellites,SpaceSci.

1994]. 3. As a result, the Figure7, the towards(away) beamsare directedessen- magnetic field strength can be determined with very tially anti-parallel (parallel) to the drift velocity. , 1004]. tectors are collocated, or in other words that the drift step is large comparedto gun-detectorseparations. The gyroperiod itself is obtained from the mean of the travel times: = Tto + T•w (7) Measuring Tto and Taw permits determination of v D. AT scalesdirectly as d/v. Hence, while the triangu- lation becomesincreasinglyless accurate, the time-offlight method becomesmore accurate with increasing drift step d, limited only by detector signal-to-noiseeffects.

TsumdaandH. Hayakawa Instituteof SpaceandAstronautical Science,3-1-1, Yoshinodai, Sagamihara, Kanagawa229,Japan M. Nakamura Departmentof Earth andPlanetaryScience,Universityof Tol9,o,Tokyo113,Japan This paperdescribes the outlineof the electronbeamboomerang experiment camed out on the GeotailspacecraR. The experiment usesan electronbeam artificiallyemittedfromthesatellite to measure thethreedimensional electricfield as well as the magnitude of the magneticfield. Unlikethe Geoselectronbeam experiment, Theboomerang experiment measures thetimeof flightof theelectron beam returningto the spacecraR, which improvesthe measuringaccuracy significantly.

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