Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coronal mass ejections and type II radio emission variability during a
  magnetic cycle on the solar-type star $\epsilon$ Eridani   We simulate possible stellar coronal mass ejection (CME) scenarios over the
magnetic cycle of $\epsilon$ Eridani (18 Eridani; HD 22049). We use three
separate epochs from 2008, 2011, and 2013, and estimate the radio emission
frequencies associated with these events. These stellar eruptions have proven
to be elusive, although a promising approach to detect and characterise these
phenomena are low-frequency radio observations of potential type II bursts as
CME induced shocks propagate through the stellar corona. Stellar type II radio
bursts are expected to emit below 450 MHz, similarly to their solar
counterparts. We show that the length of time these events remain above the
ionospheric cutoff is not necessarily dependent on the stellar magnetic cycle,
but more on the eruption location relative to the stellar magnetic field. We
find that these type II bursts would remain within the frequency range of LOFAR
for a maximum of 20-30 minutes post-eruption for the polar CMEs, (50 minutes
for 2nd harmonics). We find evidence of slower equatorial CMEs, which result in
slightly longer observable windows for the 2008 and 2013 simulations. Stellar
magnetic geometry and strength has a significant effect on the detectability of
these events. We place the CMEs in the context of the stellar mass-loss rate
(27-48 $\times$ solar mass-loss rate), showing that they can amount to 3-50% of
the stellar wind mass-loss rate for $\epsilon$ Eridani. Continuous monitoring
of likely stellar CME candidates with low-frequency radio telescopes will be
required to detect these transient events.

34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph