Prediction of Earth arrival times of interplanetary southward magnetic field turnings

Details Prediction of Earth arrival times of interplanetary southward magnetic field turnings Prediction of Earth arrival times of interplanetary southward magnetic field turnings

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10630001h&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A12, p. 30001-30010

Physics

Plasma Physics

8

Magnetospheric Physics: Forecasting, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Instruments And Techniques, Space Plasma Physics: Discontinuities

Scientific paper

ACE magnetic field and velocity data, taken in L1 halo orbit, are used to predict the arrival time at the Wind spacecraft of sharp southward turnings of the interplanetary magnetic field. If such events are assumed to be tangential discontinuities, their orientations can be deduced from the cross product of the field immediately upstream and downstream of them. It is shown that such an assumption results in better predictions of arrival times than using minimum variance or simply assuming a sunward normal. Of the 70% of events observed at ACE that could be identified at Wind, 93% of arrival times were predicted within 10 min using the cross product, compared to 56% using minimum variance and 67% assuming a sunward normal. The most important factor controlling the likelihood of observing events at Wind was the angle of the discontinuity normal from the flow direction, although weak dependencies on solar wind speed, flow-perpendicular separation, and normal-perpendicular separation were also found. These results suggest that the cross product is an accurate estimator of discontinuity orientations and that using L1 monitor data, it would be possible to predict arrival times of around 86% of southward turnings at Earth with an accuracy of 10 min.

Affiliated with

Also associated with

No associations

Rating

Prediction of Earth arrival times of interplanetary southward magnetic field turnings does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Prediction of Earth arrival times of interplanetary southward magnetic field turnings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Prediction of Earth arrival times of interplanetary southward magnetic field turnings will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1104937