Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Kinematics of a Globally Propagating Disturbance in the Solar Corona   The kinematics of a globally propagating disturbance (also known as an ``EIT
wave") is discussed using Extreme UltraViolet Imager (EUVI) data Solar
Terrestrial Relations Observatory (STEREO). We show for the first time that an
impulsively generated propagating disturbance has similar kinematics in all
four EUVI passbands (304, 171, 195, and 284 A). In the 304 A passband the
disturbance shows a velocity peak of 238+/-20 kms-1 within ~28 minutes of its
launch, varying in acceleration from 76 ms-2 to -102 ms-2. This passband
contains a strong contribution from a Si XI line (303.32 A) with a peak
formation temperature of ~1.6 MK. The 304 A emission may therefore be coronal
rather than chromospheric in origin. Comparable velocities and accelerations
are found in the coronal 195 A passband, while lower values are found in the
lower cadence 284 A passband. In the higher cadence 171 A passband the velocity
varies significantly, peaking at 475+/-47 kms-1 within ~20 minutes of launch,
with a variation in acceleration from 816 ms-2 to -413 ms-2. The high image
cadence of the 171 A passband (2.5 minutes compared to 10 minutes for the
similar temperature response 195 A passband) is found to have a major effect on
the measured velocity and acceleration of the pulse, which increase by factors
of ~2 and ~10, respectively. This implies that previously measured values
(e.g., using EIT) may have been underestimated. We also note that the
disturbance shows strong reflection from a coronal hole in both the 171 and 195
A passbands. The observations are consistent with an impulsively generated
fast-mode magnetoacoustic wave.

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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an