Title: Direction-finding measurements of auroral kilometric radiation
Abstract: Journal of Geophysical Research (1896-1977)Volume 80, Issue 19 p. 2764-2770 Direction-finding measurements of auroral kilometric radiation William S. Kurth, William S. KurthSearch for more papers by this authorMark M. Baumback, Mark M. BaumbackSearch for more papers by this authorDonald A. Gurnett, Donald A. GurnettSearch for more papers by this author William S. Kurth, William S. KurthSearch for more papers by this authorMark M. Baumback, Mark M. BaumbackSearch for more papers by this authorDonald A. Gurnett, Donald A. GurnettSearch for more papers by this author First published: 1 July 1975 https://doi.org/10.1029/JA080i019p02764Citations: 151AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Direction-finding measurements with plasma wave experiments on the Hawkeye 1 and Imp 8 satellites are used to locate the source region of auroral kilometric radiation. This radiation has peak intensities between about 100 and 300 kHz and is emitted in intense sporadic bursts lasting for from half an hour to several hours. At peak intensity the total power emitted in this frequency range exceeds 109 W. The occurrence of this radiation is known to be closely associated with bright auroral arcs which occur in the local evening auroral regions. Hawkeye 1 provides direction-finding measurements of kilometric radiation from observations at high latitudes (5–20 RE) over the northern polar regions, and Imp 8 provides similar observations at large radial distances (23–46 RE) near the equatorial plane. Results from both satellites place the source of the intense auroral kilometric radiation in the late local evening at about 22.0 hours LT and at a distance of about 0.75 RE from the polar axis of the earth. These direction-finding measurements, together with earlier results from the Imp 6 satellite, strongly indicate that the intense auroral kilometric radiation is generated by energetic auroral electrons at low altitudes in the evening auroral zone. The observed source location is in good quantitative agreement with the source position expected from simple propagation and ray path considerations. References Akasofu, S.-I., Polar and Magnetospheric Substorms, 223, D. Reidel, Dordrecht, Netherlands, 1968. Benediktov, E. A., G. G. Getmantsev, Yu. A. Sazonov, A. F. Tarasov, Preliminary results of measurement of the intensity of distributed extraterrestrial radio-frequency emission at 725- and 1525-kHz frequencies by the satellite electron-2, Kosm. Issled., 3, 614, 1965. Benediktov, E. A., G. G. Getmantsev, N. A. Mityakov, V. O. Rapoport, A. F. Tarasov, Relation between geomagnetic activity and the sporadic radio emission recorded by the electron satellites, Kosm. Issled., 6, 946, 1968. Brown, L. W., The galactic radio spectrum between 130 kHz and 2600 kHz, Astrophys. J., 180, 359, 1973. Dunckel, N., B. Ficklin, L. Rorden, R. A. Helliwell, Low-frequency noise observed in the distant magnetosphere with Ogo 1, J. Geophys. Res., 75, 1854, 1970. Frankel, M. S., LF radio noise from the earth's magnetosphere, Radio Sci., 8, 991, 1973. Gurnett, D. A., The earth as a radio source: Terrestrial kilometric radiation, J. Geophys. Res., 79, 4227, 1974. Gurnett, D. A., The earth as a radio source: The nonthermal continuum, J. Geophys. Res., 80, 2751, 1975. Kaiser, M. L., R. G. Stone, Earth as an intense planetary radio source: Similarities to Jupiter and Saturn, Science, 1975. Snyder, A. L., S.-I. Akasofu, T. N. Davis, Auroral substorms observed from above the north polar region by a satellite, J. Geophys. Res., 79, 1393, 1974. Stone, R. G., Radio physics of the outer solar system, Space Sci. Rev., 14, 534, 1973. Stone, R. G., M. L. Kaiser, R. Johnson, Radio emission from the magnetosphere (abstract), Eos Trans. AGU, 55, 398, 1974. Citing Literature Volume80, Issue19Space Physics1 July 1975Pages 2764-2770 ReferencesRelatedInformation