Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Jiamusi Pulsar Observations: II. Scintillations of 10 Pulsars   Context. Pulsars scintillate. Dynamic spectra show brightness variation of
pulsars in the time and frequency domain. Secondary spectra demonstrate the
distribution of fluctuation power in the dynamic spectra. Aims. Dynamic spectra
strongly depend on observational frequencies, but were often observed at
frequencies lower than 1.5 GHz. Scintillation observations at higher
frequencies help to constrain the turbulence feature of the interstellar medium
over a wide frequency range and can detect the scintillations of more distant
pulsars. Methods. Ten pulsars were observed at 2250 MHz (S-band) with the
Jiamusi 66 m telescope to study their scintillations. Their dynamic spectra
were first obtained, from which the decorrelation bandwidths and time scales of
diffractive scintillation were then derived by autocorrelation. Secondary
spectra were calculated by forming the Fourier power spectra of the dynamic
spectra. Results. Most of the newly obtained dynamic spectra are at the highest
frequency or have the longest time span of any published data for these
pulsars. For PSRs B0540+23, B2324+60 and B2351+61, these were the first dynamic
spectra ever reported. The frequencydependence of scintillation parameters
indicates that the intervening medium can rarely be ideally turbulent with a
Kolmogorov spectrum. The thin screen model worked well at S-band for the
scintillation of PSR B1933+16. Parabolic arcs were detected in the secondary
spectra of three pulsars, PSRs B0355+54, B0540+23 and B2154+40, all of which
were asymmetrically distributed. The inverted arclets of PSR B0355+54 were seen
to evolve along the main parabola within a continuous observing session of 12
hours, from which the angular velocity of the pulsar was estimated that was
consistent with the measurement by very long baseline interferometry (VLBI).

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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat