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Particle Anisotropy During the Onset of a Solar Event

Authors: G. M. Simnett and S. J. Tappin, University of Birmingham, U.K.; L. J. Lanzerotti, AT&T Bell Laboratories, Murray Hill, NJ; R. E. Gold and E. C. Roelof, Johns Hopkins University Applied Physics Laboratory, Laurel, MD; K. A. Anderson, Space Sciences Laboratory, University of California-Berkeley; T. P. Armstrong, University of Kansas, Lawrence, KS; R. P. Lin, Space Sciences Laboratory, University of California-Berkeley; S. M. Krimigis, Johns Hopkins University Applied Physics Laboratory, Laurel, MD; M. Pick, Observatoire de Paris, Meudon, France; E. T. Sarris, University of Thrace, Xanthi, Greece.

Presented at: European Geophysical Society Meeting, Edinburgh, Scotland, April 1992.

Solar Activity around December 1, 1990

Notes:

Main active regions around E50 solar longitude.
Region 6387 (S25) and Region 6390 (N33).
No identified optical flare with GOES x-ray flux above C5 since 10:00 UT, November 20.
There was an unidentified M1.2 x-ray flare around 01.05 UT on December 1.
The December 1 particle event at Ulysses was the largest event seen in 1990.

Figures:

(Some of the figures were originally in color; these black and white copies are somewhat degraded in quality.)

Figure 1. Figure 2.
Figure 3. Figure 4.
Figure 5. Figure 6.


(figure not available)

Figure 7. Anisotropy of P7 - 1060-5000 keV ions Figure 8.
Figure 9. Figure 10.
Figure 11. Figure 12.
Figure 13.    

Conclusions:

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Last modified March 6, 2006
T. Hunt-Ward
tizby@ftecs.com