Methods to determine the Orientation and Velocity of 2-D structures based on multi- spacecraft data

Details Methods to determine the Orientation and Velocity of 2-D structures based on multi- spacecraft data Methods to determine the Orientation and Velocity of 2-D structures based on multi- spacecraft data

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm51a1390z&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM51A-1390

Physics

2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 2731 Magnetosphere: Outer, 2784 Solar Wind/Magnetosphere Interactions, 2794 Instruments And Techniques

Scientific paper

Many techniques have been developed to study the axial orientation and/or velocity of 2-D structures (flux ropes), by analyzing in situ data from single or multiple spacecraft. To obtain the axial orientation, there are magnetic based MVA (BMVA), current based MVA (CMVA), Minimum Direction Derivative (MDD) and Multiple Triangulation Analysis (MTA) as a modified version of timing method. To further calculate the velocity, we have DeHoffmann-Teller analysis, Spatio-Temporal Difference (STD) and several version of timing method including MTA. After a brief introduction on the principle of these methods, we theoretically estimate their error ranges based on modeled structures to examine the validity of these techniques. Because of their different principles, their error bars are shown to be distinct, depending on the parameters (such as radius, model selected and even the satellite crossing path) of the certain structure. The error estimation thus provides us some clue on the selection of methods under different conditions. Some real events are further analyzed using these techniques as the example.

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