Magnetic reconnection processes in many high-energy-density astrophysical and laboratory plasma systems are significantly affected by radiation; hence traditional, nonradiative reconnection models are not applicable to these systems. Motivated by this observation, the present paper develops a Sweet–Parker-like theory of resistive magnetic reconnection with strong radiative cooling. It is found that, in the case with zero guide field, intense radiative cooling leads to a strong plasma compression, resulting in a higher reconnection rate. The compression ratio and the reconnection layer temperature are determined by the balance between ohmic heating and radiative cooling. The lower temperature in a radiatively cooled layer leads to a higher Spitzer resistivity and, hence, a higher reconnection rate. Several specific radiative processes (bremsstrahlung, cyclotron, and inverse Compton) in the optically thin regime are considered for both the zero- and strong-guide-field cases, and concrete expressions for the reconnection parameters are derived, along with the applicability conditions.

1.
D. A.
Uzdensky
and
A. I.
MacFadyen
,
Astrophys. J.
647
,
1192
(
2006
).
2.
D. A.
Uzdensky
, Division of Plasma Physics Annual Meeting, PO4.3 [Bull. Am. Phys. Soc. 53(14), 2008]; see (
2008
).
3.
R. S.
Steinolfson
and
G.
van Hoven
,
Astrophys. J.
276
,
391
(
1984
).
4.
V. L.
Dorman
and
R. M.
Kulsrud
,
Astrophys. J.
449
,
777
(
1995
).
5.
C. H.
Jaroschek
and
M.
Hoshino
,
Phys. Rev. Lett.
103
,
075002
(
2009
).
6.
K.
Nalewajko
,
M.
Begelman
,
D.
Giannios
,
M.
Sikora
, and
D.
Uzdensky
,
Mon. Not. R. Astron. Soc.
413
,
333
(
2011
).
7.
J. C.
McKinney
and
D. A.
Uzdensky
, e-print arXiv:1011.1904.
8.
R. P.
Drake
,
High-Energy-Density Physics
:
Fundamentals, Inertial Fusion, and Experimental Astrophysics
(
Springer
,
Berlin
,
2006
).
9.
P. M.
Nilson
,
L.
Willingale
,
M. C.
Kaluza
,
C.
Kamperidis
,
S.
Minardi
,
M. S.
Wei
,
P.
Fernandes
,
M.
Notley
,
S.
Bandyopadhyay
,
M.
Sherlock
,
R. J.
Kingham
,
M.
Tatarakis
,
Z.
Najmudin
,
W.
Rozmus
,
R. G.
Evans
,
M. G.
Haines
,
A. E.
Dangor
, and
K.
Krushelnick
,
Phys. Rev. Lett.
97
,
255001
(
2006
).
10.
C. K.
Li
,
F. H.
Séguin
,
J. A.
Frenje
,
J. R.
Rygg
,
R. D.
Petrasso
,
R. P. J.
Town
,
O. L.
Landen
,
J. P.
Knauer
, and
V. A.
Smalyuk
,
Phys. Rev. Lett.
99
,
055001
(
2007
).
11.
J.
Goodman
and
D.
Uzdensky
,
Astrophys. J.
688
,
555
(
2008
).
12.
K.
Kohri
,
R.
Narayan
, and
T.
Piran
,
Astrophys. J.
629
,
341
(
2005
).
13.
P. A.
Sweet
, “
Electromagnetic phenomena in cosmical physics
,” in
IAU Symposium
, edited by
B.
Lehnert
(
1958
), Vol.
6
, p.
123
.
14.
E. N.
Parker
,
J. Geophys. Res.
62
,
509
(
1957
).
15.
N. F.
Loureiro
,
A. A.
Schekochihin
, and
S. C.
Cowley
,
Phys. Plasmas
14
,
100703
(
2007
).
16.
R.
Samtaney
,
N. F.
Loureiro
,
D. A.
Uzdensky
,
A. A.
Schekochihin
, and
S. C.
Cowley
,
Phys. Rev. Lett.
103
,
105004
(
2009
).
17.
A.
Bhattacharjee
,
Y.
Huang
,
H.
Yang
, and
B.
Rogers
,
Phys. Plasmas
16
,
112102
(
2009
).
18.
P.
Cassak
,
M.
Shay
, and
J.
Drake
,
Phys. Plasmas
16
,
120702
(
2009
).
19.
D. A.
Uzdensky
,
N. F.
Loureiro
, and
A. A.
Schekochihin
,
Phys. Rev. Lett.
105
,
235002
(
2010
).
20.
E. N.
Parker
,
Astrophys. J., Suppl.
8
,
177
(
1963
).
21.
L.
Spitzer
,
Physics of Fully Ionized Gases
(
Wiley
,
New York
,
1962
).
22.
S. I.
Braginskii
,
Rev. Plasma Phys.
1
,
205
(
1965
).
23.
J. C.
Raymond
and
B. W.
Smith
,
Astrophys. J., Suppl.
35
,
419
(
1977
).
24.
G. B.
Rybicki
and
A. P.
Lightman
,
Radiative Processes in Astrophysics
(
Wiley
,
New York
,
1979
).
25.
W. J.
Karzas
and
R.
Latter
,
Astrophys. J., Suppl.
6
,
167
(
1961
).
26.
Z. W.
Ma
and
A.
Bhattacharjee
,
Geophys. Res. Lett.
23
,
1673
(
1996
).
27.
P. A.
Cassak
,
M. A.
Shay
, and
J. F.
Drake
,
Phys. Rev. Lett.
95
,
235002
(
2005
).
28.
M.
Yamada
,
Y.
Ren
,
H.
Ji
,
J.
Breslau
,
S.
Gerhardt
,
R.
Kulsrud
, and
A.
Kuritsyn
,
Phys. Plasmas
13
,
2119
(
2006
).
29.
D. A.
Uzdensky
,
Mem. Soc. Astron. Ital.
78
,
317
(
2007
);
Astrophys. J.
671
,
2139
(
2007
);
Phys. Rev. Lett.
99
,
261101
(
2007
).
[PubMed]
30.
M.
Yamada
,
H.
Ji
,
S.
Hsu
,
T.
Carter
,
R.
Kulsrud
,
N.
Bretz
,
F.
Jobes
,
Y.
Ono
, and
F.
Perkins
,
Phys. Plasmas
4
,
1936
(
1997
).
You do not currently have access to this content.