Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Witnessing tether-cutting reconnection at the onset of a partial
  eruption   In this paper, we study the onset process of a solar eruption on 21 February
2015, focusing on its unambiguous precursor phase. With multi-wavelength
imaging observations from the Atmospheric Imaging Assembly (AIA), definitive
tether-cutting (TC) reconnection signatures, i.e., flux convergence and
cancellation, bidirectional jets, as well as topology change of hot loops, were
clearly observed below the pre-eruption filament. As TC reconnection progressed
between the sheared arcades that enveloped the filament, a channel-like
magnetic flux rope (MFR) arose in multi-wavelength AIA passbands wrapping
around the main axis of the filament. With the subsequent ascent of the newborn
MFR, the filament surprisingly split into three branches. After a 7-hour slow
rise phase, the high-lying branch containing by the MFR abruptly accelerated
causing a two-ribbon flare; while the two low-lying branches remained stable
forming a partial eruption. Complemented by kinematic analysis and decay index
calculation, we conclude that TC reconnection played a key role in building up
the eruptive MFR and triggering its slow rise. The onset of the torus
instability may have led the high-lying branch into the standard eruption
scenario in the fashion of a catastrophe.

26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex