[ { "id": "authors:cxk0r-dnk92", "collection": "authors", "collection_id": "cxk0r-dnk92", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130214-090244663", "type": "article", "title": "Development of a pulsar-based time-scale", "author": [ { "family_name": "Hobbs", "given_name": "G.", "clpid": "Hobbs-G-B" }, { "family_name": "Coles", "given_name": "W.", "clpid": "Coles-W-A" }, { "family_name": "Manchester", "given_name": "R. N.", "clpid": "Manchester-R-N" }, { "family_name": "Keith", "given_name": "M. J.", "clpid": "Keith-M-J" }, { "family_name": "Shannon", "given_name": "R. M.", "clpid": "Shannon-R-M" }, { "family_name": "Chen", "given_name": "D.", "clpid": "Chen-D" }, { "family_name": "Bailes", "given_name": "M.", "orcid": "0000-0003-3294-3081", "clpid": "Bailes-M" }, { "family_name": "Bhat", "given_name": "N. D. R.", "clpid": "Bhat-N-D-R" }, { "family_name": "Burke-Spolaor", "given_name": "S.", "orcid": "0000-0003-4052-7838", "clpid": "Burke-Spolaor-S" }, { "family_name": "Champion", "given_name": "D.", "clpid": "Champion-D-J" }, { "family_name": "Chaudhary", "given_name": "A.", "clpid": "Chaudhary-A" }, { "family_name": "Hotan", "given_name": "A.", "clpid": "Hotan-A-W" }, { "family_name": "Khoo", "given_name": "J.", "clpid": "Khoo-J" }, { "family_name": "Kocz", "given_name": "J.", "orcid": "0000-0003-0249-7586", "clpid": "Kocz-J" }, { "family_name": "Levin", "given_name": "Y.", "clpid": "Levin-Yuri" }, { "family_name": "Oslowski", "given_name": "S.", "clpid": "Oslowski-S" }, { "family_name": "Preisig", "given_name": "B.", "clpid": "Preisig-B" }, { "family_name": "Ravi", "given_name": "V.", "orcid": "0000-0002-7252-5485", "clpid": "Ravi-Vikram" }, { "family_name": "Reynolds", "given_name": "J. E.", "clpid": "Reynolds-J-E" }, { "family_name": "Sarkissian", "given_name": "J.", "clpid": "Sarkissian-J-M" }, { "family_name": "van Straten", "given_name": "W.", "clpid": "van-Straten-W" }, { "family_name": "Verbiest", "given_name": "J. P. W.", "clpid": "Verbiest-J-P-W" }, { "family_name": "Yardley", "given_name": "D.", "clpid": "Yardley-D-R-B" }, { "family_name": "You", "given_name": "X. P.", "clpid": "You-X-P" } ], "abstract": "Using observations of pulsars from the Parkes Pulsar Timing Array (PPTA) project we develop the first pulsar-based time-scale that has a precision comparable to the uncertainties in International Atomic Time-scales (TAI). Our ensemble of pulsars provides an Ensemble Pulsar Scale (EPS) analogous to the free atomic time-scale \u00c9chelle Atomique Libre. The EPS can be used to detect fluctuations in atomic time-scales and therefore can lead to a new realization of Terrestrial Time, TT(PPTA11). We successfully follow features known to affect the frequency of the TAI, and we find marginally significant differences between TT(PPTA11) and TT(BIPM11). We discuss the various phenomena that lead to a correlated signal in the pulsar timing residuals and therefore limit the stability of the pulsar time-scale.", "doi": "10.1111/j.1365-2966.2012.21946.x", "issn": "0035-8711", "publisher": "Royal Astronomical Society", "publication": "Monthly Notices of the Royal Astronomical Society", "publication_date": "2012-12-21", "series_number": "4", "volume": "427", "issue": "4", "pages": "2780-2787" }, { "id": "authors:dv3zj-d6t85", "collection": "authors", "collection_id": "dv3zj-d6t85", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120605-123432521", "type": "article", "title": "Observation of thundercloud-related gamma rays and neutrons in Tibet", "author": [ { "family_name": "Tsuchiya", "given_name": "H.", "clpid": "Tsuchiya-H" }, { "family_name": "Hibino", "given_name": "K.", "clpid": "Hibino-K" }, { "family_name": "Kawata", "given_name": "K.", "clpid": "Kawata-K" }, { "family_name": "Hotta", "given_name": "N.", "clpid": "Hotta-N" }, { "family_name": "Tateyama", "given_name": "N.", "clpid": "Tateyama-N" }, { "family_name": "Ohnishi", "given_name": "M.", "clpid": "Ohnishi-M" }, { "family_name": "Takita", "given_name": "M.", "clpid": "Takita-M" }, { "family_name": "Chen", "given_name": "D.", "clpid": "Chen-D" }, { "family_name": "Huang", "given_name": "J.", "clpid": "Huang-J" }, { "family_name": "Miyasaka", "given_name": "M.", "clpid": "Miyasaka-M" }, { "family_name": "Kondo", "given_name": "I.", "clpid": "Kondo-I" }, { "family_name": "Takahashi", "given_name": "E.", "clpid": "Takahashi-E" }, { "family_name": "Shimoda", "given_name": "S.", "clpid": "Shimoda-S" }, { "family_name": "Yamada", "given_name": "Y.", "clpid": "Yamada-Y" }, { "family_name": "Lu", "given_name": "H.", "clpid": "Lu-H" }, { "family_name": "Zhang", "given_name": "J. L.", "clpid": "Zhang-J-L" }, { "family_name": "Yu", "given_name": "X. X.", "clpid": "Yu-X-X" }, { "family_name": "Tan", "given_name": "Y. H.", "clpid": "Tan-Y-H" }, { "family_name": "Nie", "given_name": "S. M.", "clpid": "Nie-S-M" }, { "family_name": "Munakata", "given_name": "K.", "clpid": "Munakata-K" }, { "family_name": "Enoto", "given_name": "T.", "clpid": "Enoto-T" }, { "family_name": "Makishima", "given_name": "K.", "clpid": "Makishima-K" } ], "abstract": "During the 2010 rainy season in Yangbajing (4300 m above sea level) in Tibet, China, a long-duration count enhancement associated with thunderclouds was detected by a solar-neutron telescope and neutron monitors installed at the Yangbajing Comic Ray Observatory. The event, lasting for \u223c40\u2009\u2009min, was observed on July 22, 2010. The solar-neutron telescope detected significant \u03b3-ray signals with energies >40\u2009\u2009MeV in the event. Such a prolonged high-energy event has never been observed in association with thunderclouds, clearly suggesting that electron acceleration lasts for 40 min in thunderclouds. In addition, Monte Carlo simulations showed that >10\u2009\u2009MeV \u03b3 rays largely contribute to the neutron monitor signals, while >1\u2009\u2009keV neutrons produced via a photonuclear reaction contribute relatively less to the signals. This result suggests that enhancements of neutron monitors during thunderstorms are not necessarily clear evidence for neutron production, as previously thought.", "doi": "10.1103/PhysRevD.85.092006", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2012-05-10", "series_number": "9", "volume": "85", "issue": "9", "pages": "092006" } ]