Timing accuracy and variability of the planar propagation of magnetic field structures in the solar wind

Details Timing accuracy and variability of the planar propagation of magnetic field structures in the solar wind Timing accuracy and variability of the planar propagation of magnetic field structures in the solar wind

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh21c0439o&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH21C-0439

Physics

7524 Magnetic Fields, 2134 Interplanetary Magnetic Fields

Scientific paper

The propagation time of the interplanetary magnetic field (IMF) from an upstream monitor to the magnetosphere may be significantly different from what would be predicted using the advection delay time at the solar wind velocity. This influences our ability to correlate magnetosphere-ionosphere phenomena with solar wind variations. Earlier studies revealed that variable lag times and tilted propagation planes in the IMF could account for this timing difference. Using 3 or more satellites the time varying orientation of the tilted propagation planes can be determined. Alternatively, the time varying plane orientations can be derived with data from a single spacecraft using a modified minimum variance approach. The validity of the derived planes for describing the structure and propagation of the IMF is evaluated by predicting the IMF observations at the location of an additional spacecraft not used in the calculation of the time varying plane orientations. The range of orientations and temporal variability of the propagation planes will be presented for several cases, comparing the 3-spacecraft solution with the single spacecraft solution. The orientation of the time varying propagation planes is observed to vary over a wide range of angles with time scales of 10's of minutes.

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