Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rapid magnetic flux variability on the flare star CN Leonis   We present UVES/VLT observations of the nearby flare star CN Leo covering the
Wing-Ford FeH band near 1mu with high spectral resolution. Some of the FeH
absorption lines in this band are magnetically sensitive and allow a
measurement of the mean magnetic flux on CN Leo. Our observations, covering
three nights separated by 48 hours each, allow a clear detection of a mean
magnetic field of Bf~2.2kG. The differential flux measurements show a
night-to-night variability with extremely high significance. Finally, our data
strongly suggest magnetic flux variability on time scales as low as 6 hours in
line with chromospheric variability.

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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an