Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh43c..02w&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH43C-02
Other
2109 Discontinuities (7811), 2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma, 2194 Instruments And Techniques, 7924 Forecasting (2722)
Scientific paper
It has been known that the variations in the Interplanetary Magnetic Field (IMF) occur within planes that are tilted with respect to the solar wind velocity vector. This tilting of the IMF phase fronts may cause the propagation from a point of observation to another location to have delay times that vary substantially. Therefore, for accurate delay calculations in real time it is necessary to be able to determine the phase front orientation angles using the magnetic field measurements on one spacecraft only. Methods for calculating this tilt angle have been tested for accuracy by a comparison with the angles measured by multiple satellites. One method is a variation of the minimum variance of the magnetic field, where it is constrained by the condition that the average field along the phase front normal is zero. This method is referred to as MVAB-0. Another technique is to simply calculate the vector cross product between magnetic fields measured at two different sample times. The choices of the different parameters for the calculation and error discrimination are critical. An optimization of parameters was done by testing how well the propagation delays from one spacecraft to another are predicted. The tests have indicated that, when optimized, both procedures work comparably well. It had also been found that further improvements to time delay predictions are obtained by combining both the MVAB-0 and cross product techniques together into one calculation method, where the results of both must be in near agreement.
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