The Sidereal Correlation of Extensive Air Showers

Farley, F. J. M.; Storey, J. R.

doi:10.1088/0370-1298/67/11/306

Cited by 76 publications

(55 citation statements)

References 11 publications

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“…There was some evidence in the binned data for excess event numbers toward both outer radio lobes (Clay et al 1984). Some supporting evidence was also noted in two other Southern Hemisphere experiments (Farley and Storey 1954;Kamata et al 1968), though with differing energy thresholds, angular resolutions, and years of operation. It was also acknowledged that, at PeV energies, the signal could not be due to gamma rays from Cen A as the path length for interactions of PeV gamma rays with CMB photons is only 10 kpc (Clay et al 1984).…”

Section: Searches At Pev Energiessupporting

confidence: 64%

Centaurus A at Ultra-High Energies

Clay

Whelan

Edwards

2010

Publ. – Astron. Soc. Aust

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Abstract:We review the importance of Centaurus A in high-energy astrophysics as a nearby object with many of the properties expected of a major source of very high-energy cosmic rays and gamma rays. We examine observational techniques and the results so far obtained in the energy range from 200 GeV to above 100 EeV and attempt to fit those data to expectations of Centaurus A as an astrophysical source from very high to ultra-high energies.

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Section: Searches At Pev Energiessupporting

confidence: 64%

Centaurus A at Ultra-High Energies

Clay

Whelan

Edwards

2010

Publ. – Astron. Soc. Aust

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“…If either temperature or pressure variations have Fourier components in sidereal time, spurious components may be introduced into the shower detection rate (Farley & Storey 1954). Various methods are used in order to study the dependence of event rate on atmospheric ground pressure, P, and temperature, T (Antoni et al 2004).…”

Section: Data Analysis and Discussionmentioning

confidence: 99%

Galactic Anisotropy of Cosmic Ray Intensity Observed by an Air Shower Experiment

Bahmanabadi

Ghomi

Sheidaei

et al. 2006

Publ. – Astron. Soc. Aust

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Abstract:We have monitored multi-TeV cosmic rays by a small air shower array in Tehran (35843 0 N, 51820 0 E, 1200 m = 890 g cm -2 ). More than 1.1 6 10 6 extensive air shower events were recorded. These observations enabled us to analyse sidereal variation of the galactic cosmic ray intensity. The observed sidereal daily variation is compared to the expected variation which includes the Compton-Getting effect due to the motion of the earth in the Galaxy. In addition to the Compton-Getting effect, an anisotropy has been observed which is due to a unidirectional anisotropy of cosmic ray flow along the Galactic arms.

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“…They claimed no significant sidereal effect, but Linsley and Watson (1977) deduced 0·l(±0·1)% at 148(±57)0 R.A. from their histograms. Farley and Storey (1954) (37"S) with 8·9x10 s events at 1015 eVobtained a dataset interpreted by Linsley and Watson as giving an anisotropy of 0 . 14(±0 ·15)% at 214(±61)° R.A. Data at somewhat lower energies have been reviewed by Elliott (1979) and above 10 12 eV appear to give a roughly energy independent anisotropy of -0·08% at -1 hr R.A. At higher energies (10 14 _10 16 eV) characteristic first harmonic phases are -180°-360° R.A. with amplitudes compatible only with the statistical uncertainty associated with the size of the dataset (see Clay 1987Clay a, 1987b.…”

Section: Discussionmentioning

confidence: 99%

“…However, there will still not be completely uniform coverage in sidereal time due to breaks in the data when data tapes are changed and array maintenance is performed, nor will there be a complete cancellation of any spurious effects due to atmospheric pressure variations. In analysing a dataset such as this, an option is to apply the procedure of Farley and Storey (1954) which examines other Fourier components in the event sequence to correct the sidereal harmonics. Such a procedure was rejected in this case because we found that a large correction was necessary resulting from some equipment breakdowns in the second year of operation.…”

Section: Observationsmentioning

confidence: 99%