Phase diagram for magnetic reconnection in heliophysical, astrophysical, and laboratory plasmas

Journal Article · Tue Nov 15 00:00:00 EST 2011 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3647505· OSTI ID:22047037

Hantao, Ji ^[1]; Daughton, William ^[2]

---

1. Center for Magnetic Self-Organization, Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Recent progress in understanding the physics of magnetic reconnection is conveniently summarized in terms of a phase diagram which organizes the essential dynamics for a wide variety of applications in heliophysics, laboratory, and astrophysics. The two key dimensionless parameters are the Lundquist number and the macrosopic system size in units of the ion sound gyroradius. In addition to the conventional single X-line collisional and collisionless phases, multiple X-line reconnection phases arise due to the presence of the plasmoid instability either in collisional and collisionless current sheets. In particular, there exists a unique phase termed ''multiple X-line hybrid phase'' where a hierarchy of collisional islands or plasmoids is terminated by a collisionless current sheet, resulting in a rapid coupling between the macroscopic and kinetic scales and a mixture of collisional and collisionless dynamics. The new phases involving multiple X-lines and collisionless physics may be important for the emerging applications of magnetic reconnection to accelerate charged particles beyond their thermal speeds. A large number of heliophysical and astrophysical plasmas are surveyed and grouped in the phase diagram: Earth's magnetosphere, solar plasmas (chromosphere, corona, wind, and tachocline), galactic plasmas (molecular clouds, interstellar media, accretion disks and their coronae, Crab nebula, Sgr A*, gamma ray bursts, and magnetars), and extragalactic plasmas (active galactic nuclei disks and their coronae, galaxy clusters, radio lobes, and extragalactic jets). Significance of laboratory experiments, including a next generation reconnection experiment, is also discussed.

• OSTI ID: 22047037
• Journal Information: Physics of Plasmas, Vol. 18, Issue 11; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ACCRETION DISKS
ASTROPHYSICS
CHROMOSPHERE
COSMIC GAMMA BURSTS
COUPLING
CRAB NEBULA
EARTH MAGNETOSPHERE
GALAXY CLUSTERS
GALAXY NUCLEI
IONS
MAGNETIC RECONNECTION
MAGNETOHYDRODYNAMICS
PHASE DIAGRAMS
PLASMA
PLASMA INSTABILITY
PLASMA JETS
PLASMOIDS
SOLAR WIND
SOUND WAVES