Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic explosions: role of the inductive electric field   Inclusion of the inductive electric field, ${\bf E}_{\rm ind}$ due to the
temporally changing ${\bf B}$, in magnetic explosions is discussed, with
emphasis on solar flares. Several roles played by ${\bf E}_{\rm ind}$ are
identified: on a global scale, ${\bf E}_{\rm ind}$ produces the EMF that drives
the explosion; the associated ${\bf E}_{\rm ind}\times{\bf B}$ drift is
identified with the inflow of magnetic field lines into a reconnection region;
the polarization current, associated with $\partial{\bf E}_{\rm ind}/\partial
t$, implies a ${\bf J}\times{\bf B}$ force that accelerates this inflow; and
the component of ${\bf E}_{\rm ind}$ parallel to ${\bf B}$ accelerates the
energetic electrons that cause hard X-ray emission and type III radio bursts.
Some simple models that describe these effects are presented. A resolution of
the long-standing "number problem" in solar flares is suggested.

33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int