Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Reconnection Invoked by Sweeping of the CME-Driven Fast-Mode
  Shock   Coronal waves exist ubiquitously in the solar atmosphere. They are important
not only in their own rich physics but also essential candidates of triggering
magnetic eruptions in the remote. However, the later mechanism has never been
directly confirmed. By revisiting the successive eruptions on 2012 March 7,
fast-mode shocks are identified to account for the X5.4 flare-related EUV wave
with a velocity of 550 km/s, and appeared faster than 2060$\pm$270 km/s at the
front of the corresponding coronal mass ejection in the slow-rising phase. They
not only propagated much faster than the local Alfven speed of about 260 km/s,
but also simultaneously accompanied by type II radio burst, i.e., a typical
feature of shock wave. The observations show that the shock wave disturbs the
coronal loops C1 connecting active regions (ARs) 11429 and 11430, which is
neighboring a null point region. Following a 40-min-oscillation, an external
magnetic reconnection (EMR) occurred in the null point region. About 10 min
later, a large-scale magnetic flux rope (MFR) overlaid by the C1 became
unstable and erupted quickly. It is thought that the fast-mode shock triggered
EMR in the null point region and caused the subsequent eruptions. This scenario
is observed directly for the first time, and provides new hint for
understanding the physics of solar activities and eruptions.

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The categories of this paper are: eess
16
The categories of this paper are: stat
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn