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A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 × 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to ∼ 250  GeV, but, from 20(More)
Olivier Witasse, Jean-Pierre Lebreton, Michael K. Bird, Robindro Dutta-Roy, William M. Folkner, Robert A. Preston, Sami W. Asmar, Leonid I. Gurvits, Sergei V. Pogrebenko, Ian M. Avruch, Robert M. Campbell, Hayley E. Bignall, Michael A. Garrett, Huib Jan van Langevelde, Stephen M. Parsley, Cormac Reynolds, Arpad Szomoru, John E. Reynolds, Chris J. Phillips,(More)
We report the results of a successful 12 hour 22 GHz VLBI experiment using a heterogeneous network that includes radio telescopes of the Long Baseline Array (LBA) in Australia and several VLBI stations that regularly observe in geodetic VLBI campaigns. We have determined positions of three VLBI stations, atca-104, ceduna and mopra, with an accuracy of 4–30(More)
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