Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A New Method of 3D Magnetic Field Reconstruction   A method is described to model the magnetic field in the vicinity of
constellations of multiple satellites using field and plasma current
measurements. This quadratic model has the properties that the divergence is
zero everywhere and matches the measured values of the magnetic field and its
curl (current) at each spacecraft, and thus extends the linear curlometer
method to second order. It is able to predict the topology of the field lines
near magnetic structures, such as near reconnecting regions or flux ropes, and
allows a tracking of the motion of these structures relative to the spacecraft
constellation. Comparisons to PIC simulations estimate the model accuracy.
Reconstruction of two electron diffusion regions show the expected field line
structure. The model can be applied to other small-scale phenomena (bow shock,
waves of commensurate wavelength), and can be modified to reconstruct also the
electric field, allowing tracing of particle trajectories.

37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg