Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh23b1846z&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH23B-1846
Physics
Plasma Physics
[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7851] Space Plasma Physics / Shock Waves
Scientific paper
Two most significant space weather drivers that cause a wide range of severe effects on human activities are solar energetic particles (SEPs) and coronal mass ejections (CMEs). Observations at 1 AU indicated that the most frequently observed CMEs (about 2/3 of events) do not have flux-rope structure and the most frequently observed SEPs (about 1000 events per year) enrich their 3He abundances. 3He is a most important and clean fuel of thermonuclear fusion. It is rather rare on Earth, but its abundance is extremely enhanced in the satellite material and the Moon’s upper layer of the regolith due to the 3He-enrichments in SEP events. Recently, the initiation of 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 lead to solar 3He-rich events and generate jet-like plasma outflows, which may be further developed into CMEs without magnetic flux-rope topology if enough energy is deposited. This study examines the properties of non-flux-rope CME driven shocks and the connection to the particle acceleration in solar 3He-rich events.
Wu Seongho
Zhang Tianmeng
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