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Science 20 October 1995:
Vol. 270. no. 5235, p. 357
DOI:

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This Week in Science

Solar flares and other energetic processes inject electrons and ions into space, where they are guided by the solar magnetic field. Electron interactions with plasma can generate radio emissions (type II radio bursts) whose frequency decreases with distance from the sun. Such emissions are beamed along the solar system plane, so they are best observed from above or below the ecliptic. Reiner et al. (p. 461) report radio measurements obtained from the Ulysses spacecraft, which was put into an orbit that takes it over the poles of the sun. Such measurements allow coronal disturbances to be tracked as they move away from the sun, and they also verify theoretical predictions that the solar coronal magnetic field has an Archimedean spiral structure.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)