MHD Shocks Driven by Jets/CMEs without Magnetic Flux-Rope Topology and Origin of 3He-Rich SEP Events

Details MHD Shocks Driven by Jets/CMEs without Magnetic Flux-Rope Topology and Origin of 3He-Rich SEP Events MHD Shocks Driven by Jets/CMEs without Magnetic Flux-Rope Topology and Origin of 3He-Rich SEP Events

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41a1642z&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH41A-1642

Physics

Plasma Physics

[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7526] Solar Physics, Astrophysics, And Astronomy / Magnetic Reconnection, [7851] Space Plasma Physics / Shock Waves

Scientific paper

Space weather causes a wide range of severe effects on human activities. Two most significant space weather drivers are solar energetic particles (SEPs) and coronal mass ejections (CMEs). The SEP observations have revealed that 3He-rich SEP events originate from the open field regions near the closed magnetic field lines at the coronal base. The CME observations at 1 AU have indicated that only 1/3 of CMEs have a flux-rope structure, while other 2/3 of CMEs have a complex disordered magnetic field. Recently, the initiation of jet-like plasma outflows and CMEs without flux-rope topology have been simulated with a three-dimensional, time-dependent, self-consistent, flux emergence and reconnection, magnetohydrodynamic (MHD) model. This was done through emerging magnetic flux of one polarity from the photosphere, beneath the open field lines of the opposite polarity near the closed magnetic field lines. The results indicated that the magnetic flux emergence and reconnection can produce the magnetic topology that can lead to solar 3He-rich events and generate jet-like plasma outflows, which may further be developed into CMEs without magnetic flux-rope topology if enough energy is deposited. This study examines the properties of the MHD shocks driven by the jet-like plasma outflows and non-flux-rope CMEs and acceleration of particles.

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