Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Switchbacks Explained: Super-Parker Fields -- the Other Side of the
  Sub-Parker Spiral   We provide a simple geometric explanation for the source of switchbacks and
associated large and one-sided transverse flows in the solar wind observed by
Parker Solar Probe. The more radial, Sub-Parker Spiral structure of the
heliospheric magnetic field observed previously by Ulysses, ACE, and STEREO is
created within rarefaction regions where footpoint motion from the source of
fast into slow wind at the Sun creates a magnetic field line connection across
solar wind speed shear. Conversely, when foot-points move from the source of
slow wind into faster wind, a Super-Parker Spiral field structure is formed:
below the Alfven critical point, one-sided transverse field-aligned flows
develop; above the Alfven critical point, the field structure contracts between
adjacent solar wind flows, and the radial field component decreases in
magnitude with distance from the Sun, eventually reversing into a switchback.
The Sub-Parker and Super-Parker Spirals behave functionally as opposites.
Observations from Parker Solar Probe confirm the paucity of switchbacks within
rarefaction regions and immediately outside these rarefaction regions, we
observe numerous switchbacks in the magnetic field that are directly associated
with abrupt transients in solar wind speed. The radial component of the
magnetic field, the speed gradients, radial Alfven speed, and the ratio of the
sound speed to the radial Alfven speed all conform to predictions based on the
Sub-Parker and Super-Parker Spirals within rarefaction regions and solar wind
speed enhancements (spikes or jets), respectively. Critically, the predictions
associated with the Super- Parker Spiral naturally explain the observations of
switchbacks being associated with unexpectedly large and one-sided tangential
flows.

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The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
12
The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
2
The categories of this paper are: math