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  1. No Access

    Chapter and Conference Paper

    An H2O flare in W49N

    We monitored the 22-GHz water vapor emission from W49N using a single VLBA antenna on intervals of a few days to about a week from December 1989 through May 1990. During this period, a strong flare occurred in...

    David A. Boboltz, John H. Simonetti, P. J. Diamond… in Astrophysical Masers (1993)

  2. No Access

    Chapter and Conference Paper

    A monitoring program of interstellar OH and H2O masers

    We obtained spectra of a set of interstellar-OH and H2O masers at intervals of a few days to about a week throughout a period of about 5 months. The purpose was to determine whether interstellar scintillation and...

    John H. Simonetti, P. J. Diamond, Jeffrey A. Uphoff, David Boboltz… in Astrophysical Masers (1993)

  3. No Access

    Chapter and Conference Paper

    Low frequency propagation in the Earth's magnetosphere

    Our principal conclusion is that large orbital radii will be required for imaging at 1.5 MHz. The minimum radius has not been determined, but it is at least 2.5R⊕ under conditions of solar maximum. Successful ima...

    Brian Dennison, S. Ananthakrishnan, M. Desch… in Low Frequency Astrophysics from Space (1990)

  4. Article

    Combined subarachnoid and epidural block for Caesarean section

    Brian Dennison in Canadian Journal of Anaesthesia (1987)

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  5. No Access

    Article

    Radio wave scattering in the galactic disk

    Electron density turbulence in the Galaxy causes radio sources to be broadened angularly by amounts that depend strongly on the direction of the source. Recent scattering measurements using very long baseline ...

    J. M. Cordes, S. Ananthakrishnan, Brian Dennison in Nature (1984)

  6. No Access

    Article

    Search for X-ray emission from AO0235+164

    THE BL Lacertae object, AO0235 + 164, is one of the best documented cases of the inverse-Compton scattering problem, that is, the brightness temperature of the emitting region, as implied by rapid variability ...

    BRIAN DENNISON, J. P. DELVAILLE, A. EPSTEIN, H. W. SCHNOPPER in Nature (1978)

  7. No Access

    Article

    Deflection of polarised radiation: relative phase delay technique

    THE weak equivalence principle states that the world line of a freely falling test particle is independent of its structure and composition. Until recently1,2, experiments designed to detect variations in the geo...

    BRIAN DENNISON, GARY MELNICK, MARTIN HARWIT, T. SATO, C. T. STELZRIED… in Nature (1978)

  8. No Access

    Chapter and Conference Paper

    Far Infrared Polarization of Dust Clouds

    The recently observed 10µ polarization of the Orion Nebula and the Galactic Center suggests that far infrared polarization may be found in these objects. Estimates are made of the degree of far infrared polari...

    Brian Dennison in Infrared and Submillimeter Astronomy (1977)

  9. No Access

    Article

    Improved upper limits of gravitational deflection of polarised radiation

    RECENTLY Harwit et al.1 established upper limits for any polarisation dependence in the bending of radio waves by the Sun's gravitational field. Any differential angular splitting between orthogonal polarisations...

    BRIAN DENNISON, JOHN DICKEY, DAVID JAUNCEY in Nature (1976)

  10. No Access

    Article

    Glaciations and dense interstellar clouds

    McCREA has revived the idea that the Earth's ice ages may have been caused by the interaction of the Sun with dense interstellar clouds1. In this theory, originally formulated by Hoyle and Lyttleton2, the solar l...

    BRIAN DENNISON, V. N. MANSFIELD in Nature (1976)

  11. No Access

    Article

    Gravitational deflection of polarised radiation

    An upper limit is determined for the difference in the deflection of beams of orthogonally polarised radiation passing through the Sun's gravitational field. A null result is anticipated by present theories of...

    Martin Harwit, R. V. E. Lovelace, Brian Dennison, David L. Jauncey… in Nature (1974)