Open AccessThree-dimensional MHD simulation of interplanetary magnetic field changes at 1 AU as a consequence of simulated solar flares
Author(s) -
ChinChun Wu,
M. Dryer,
S. T. Wu
Publication year - 1996
Publication title -
annales geophysicae
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.522
H-Index - 93
eISSN - 1432-0576
pISSN - 0992-7689
DOI - 10.1007/s00585-996-0383-1
Subject(s) - interplanetary magnetic field , heliospheric current sheet , physics , magnetohydrodynamics , polarity (international relations) , interplanetary spaceflight , northern hemisphere , solar flare , geophysics , solar wind , astrophysics , magnetic field , computational physics , atmospheric sciences , genetics , quantum mechanics , biology , cell
A fully three-dimensional (3D),time-dependent, MHD interplanetary global model (3D IGM) has been used, for thefirst time, to study the relationship between different forms of solar activityand transient variations of the north-south component, Bz, ofthe interplanetary magnetic field (IMF) at 1 AU. One form of solar activity, theflare, is simulated by using a pressure pulse at different locations near thesolar surface and observing the simulated IMF evolution of B\u3b8(=–Bz) at 1 AU. Results show that, for a given pressure pulse,the orientation of the corresponding transient variation of Bzhas a strong relationship to the location of the pressure pulse and the initialconditions of the IMF. Two initial IMF conditions are considered: a unipolarArchimedean spiral with outward polarity and a flat heliospheric current sheet (HCS)with outward polarity in the northern hemisphere and which gradually reversespolarity in the solar equatorial plane to inward polarity in the southernheliospheric hemisphere. The wave guide effect of the HCS is also demonstrated