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Solar wind observations

WIND observed a rapid northward IMF rotation at 20:47 UT, and IMP 8 detected this event 35-min later at 21:22 UT. The IMF data are shown in Figure 2, where the WIND data (solid lines) are shifted forward by 35 minutes. At both satellites, the IMF tex2html_wrap_inline434 suddenly increased from a few nT to 10 nT without any significant change in the IMF magnitude. The solar wind speed is about 430 km stex2html_wrap_inline442 and the distance between these two spacecraft along the x-axis is 98 tex2html_wrap_inline432, suggesting a 24-min time delay. The observed delay is obtained if the discontinuity is tilted +45tex2html_wrap_inline446 in the xy plane.



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