Survey of solar wind behavior to prepare for use in global heliospheric models

Details Survey of solar wind behavior to prepare for use in global heliospheric models Survey of solar wind behavior to prepare for use in global heliospheric models

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh21b1812t&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH21B-1812

Physics

[2101] Interplanetary Physics / Coronal Mass Ejections, [2102] Interplanetary Physics / Corotating Streams, [2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions, [2164] Interplanetary Physics / Solar Wind Plasma

Scientific paper

Spacecraft measurements, including the Voyagers and recently IBEX, have demonstrated the highly time-dependent nature of the heliosphere. Our research group is working to more accurately model the long-term effects of the solar wind on the heliosphere. We use global heliospheric models and are developing a dynamic, anisotropic inner boundary condition to model this changing environment. Using the OMNI data set created by NASA, we have access to in situ solar wind information dating back to 1963. The data variables that span the four solar cycles of OMNI are the IMF magnitude and direction and three plasma variables: velocity, density and temperature. We perform statistical and spectral analyses of these variables and a set of composite variables, including plasma β , ram pressure, the solar wind quasi-invariant and perpendicular pressure. These analyses are used to develop an automated classification scheme, dividing the data into fast, slow, ICME and CIR. Classification allows for more refined statistics of each category, to be used in extrapolating the OMNI signal, so as to have a dynamic, anisotropic boundary condition for the entire ecliptic disk.

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