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Science 24 November 1995:
Vol. 270. no. 5240, p. 1277
DOI:

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This Week in Science

Ultraviolet images of the Earth reveal an auroral halo caused by the interaction of geomagnetic field lines with the solar wind. At times a connecting bar is seen that runs over the magnetic poles in the noon to midnight direction. It has been thought that this barred aurora, or Theta-aurora, occurs when the interplanetary magnetic field (IMF) is pointed north. Newell and Meng (p. 1338) present satellite data which show that Theta-auroras occur when the IMF flips south after a long period of pointing northward.




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