Pictures of an atmospheric pressure arc between two concentric copper electrodes at different external magnetic fields (B field) were taken using a charge-coupled device camera and a complementary metal-oxide-semiconductor camera. The pictures reveal splitting of the arc column into a column with multiple arc roots (i.e., cathode spots), repulsion of cathode spots due to their self-induced B fields, and grouping of cathode spots under the influence of B field. Power frequency spectra analysis of the voltage fluctuations was also performed.

1.
B.
Jüttner
,
J. Phys. D
34
,
R103
(
2001
) and reference therein.
2.
M. G.
Drouet
,
IEEE Trans. Plasma Sci.
PS-13
,
235
(
1985
).
3.
B. E.
Djakov
and
B.
Jüttner
,
J. Phys. D
35
,
2570
(
2002
).
4.
K. D.
Froome
,
Proc. Phys. Soc. London
B62
,
805
(
1949
).
5.
M. S.
Agarwal
and
R.
Holmes
,
J. Phys. D
17
,
743
(
1984
).
6.
J. C.
Sherman
,
R.
Webster
,
J. E.
Jenkins
, and
R.
Holmes
,
J. Phys. D
8
,
696
(
1975
).
7.
P.
Siemroth
,
T.
Schulke
, and
T.
Witke
,
IEEE Trans. Plasma Sci.
PS-23
,
919
(
1985
).
8.
B.
Jüttner
,
IEEE Trans. Plasma Sci.
PS-15
,
474
(
1987
).
9.
E. L.
Murphy
and
R. H.
Good
,
Phys. Rev.
102
,
1465
(
1956
).
10.
G.
Ecker
,
Ergeb. Exakten Naturwiss.
33
,
1
(
1955
).
11.
R. N.
Szente
,
R. J.
Munz
, and
M. G.
Drouet
,
Prog. Opt.
7
,
349
(
1992
).
12.
A. E.
Guile
and
A. H.
Hitchcock
,
Proc. IEEE
124
,
148
(
1977
).
13.
R. N.
Szente
,
R. J.
Munz
, and
M. G.
Drouet
,
Plasma Chem. Plasma Process.
12
,
3
(
1992
).
14.
M. S.
Benilov
and
A.
Marotta
,
J. Phys. D
28
,
1869
(
1995
).
15.
M. G.
Drouet
,
Jpn. J. Appl. Phys.
20
,
10270
(
1981
).
16.
A.
Anders
,
E. M.
Oks
, and
G. Y.
Yushkov
,
Appl. Phys. Lett.
86
,
211503
(
2005
).
17.
A.
Anders
,
IEEE Trans. Plasma Sci.
33
,
1456
(
2005
).
You do not currently have access to this content.