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Energy release and transfer in guide field reconnection
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Image of FIG. 1.
FIG. 1.

Initial pressure distribution (top) and ion flow speed at two characteristic times for case A1 with initially uniform guide field , as defined in Table I.

Image of FIG. 2.
FIG. 2.

Evolution of the reconnected flux (a) for cases A1 and A2 with initially uniform guide field and (b) for cases B1, B2, and B3 starting from a force-free field, as defined in Table I. The corresponding MHD runs are based on localized resistivity defined by Eqs. (12) and (13) with .

Image of FIG. 3.
FIG. 3.

Energy outflow for PIC simulations A1 (left) and B1 (right) near the time of fastest reconnection, showing (from top to bottom) Poynting flux , ion enthalpy flux , electron enthalpy flux , ion bulk kinetic energy flux , and electron bulk kinetic energy flux . Black rectangles indicate the boundaries of boxes used to integrate incoming and outgoing energy fluxes discussed in Sec. IV.

Image of FIG. 4.
FIG. 4.

Late configurations of runs with initially uniform : (left) PIC simulation A1 (Table I) at , (right) corresponding MHD simulation at with . From top to bottom: density , pressure , the magnetic field component , the current density component , and the temperature given by .

Image of FIG. 5.
FIG. 5.

Same as Fig. 4 but for initially force-free fields B1 (PIC) and a corresponding MHD run with .

Image of FIG. 6.
FIG. 6.

Integral quantities at late times as functions of for the cases with initially constant . The top row shows, from left to right: mass , footpoint displacement , and entropy function for PIC run A1 (red dashed-dotted lines) and MHD (blue solid lines) with , using and instead of Eq. (13). The bottom row shows, from left to right: density , magnetic field component , and pressure .

Image of FIG. 7.
FIG. 7.

Same as Fig. 6 but for the initially force-free cases B1 (PIC) and MHD with .

Image of FIG. 8.
FIG. 8.

Ion pressure components parallel (top) and perpendicular (center) to the magnetic field and ion velocity distributions (bottom) integrated over the black rectangle indicated in the top panels at , for the force-free initial case B1.

Image of FIG. 9.
FIG. 9.

Same as Fig. 8 but at .


Generic image for table
Table I.

Initial parameters for seven PIC runs.

Generic image for table
Table II.

Dissipation and energy transfer for the runs listed in Table I. denotes Joule dissipation, defined by Eq. (24); is the transfer by Lorentz forces (25); the work done by pressure gradient forces (26); the magnetic energy (Poynting) flux, defined by Eq. (15); and enthalpy flux (19). The last two columns contain the net flux of bulk kinetic energy , Eq. (21), and heat flux, , summed over both particle species. The latter was evaluated only for cases B and C.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Energy release and transfer in guide field reconnection