Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lifetimes and Rotation within the Solar Mean Magnetic Field   We have used very high-cadence (sub-minute) observations of the solar mean
magnetic field (SMMF) from the Birmingham Solar Oscillations Network (BiSON) to
investigate the morphology of the SMMF. The observations span a period from
1992--2012, and the high-cadence observations allowed the exploration of the
power spectrum up to frequencies in the mHz range. The power spectrum contains
several broad peaks from a rotationally-modulated (RM) component, whose
linewidths allowed us to measure, for the first time, the lifetime of the RM
source. There is an additional broadband, background component in the power
spectrum which we have shown is an artefact of power aliasing due to the low
fill of the data. The sidereal rotation period of the RM component was measured
as $25.23 \pm 0.11$ days and suggests that the signal is sensitive to a
time-averaged latitude of $\sim 12^{\circ}$. We have also shown the RM lifetime
to be $139.6 \pm 18.5$ days. This provides evidence to suggest the RM component
of the SMMF is connected to magnetic flux concentrations (MFCs) and active
regions (ARs) of magnetic flux, based both on its lifetime and location on the
solar disc.

14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex