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  1. No Access

    Article

    Evidence that Synchrotron Emission from Nonthermal Electrons Produces the Increasing Submillimeter Spectral Component in Solar Flares

    We investigate the origin of the increasing spectra observed at submillimeter wavelengths detected in the flare on 2 November 2003 starting at 17:17 UT. This flare, classified as an X8.3 and 2B event, was sim...

    Adriana V. R. Silva, G. H. Share, R. J. Murphy, J. E. R. Costa… in Solar Physics (2007)

  2. No Access

    Chapter

    RHESSI Observation of Atmospheric Gamma Rays from Impact of Solar Energetic Particles on 21 April 2002

    The RHESSI high-resolution spectrometer detected γ-ray lines and continuum emitted by the Earth’s atmosphere during impact of solar energetic particles in the south polar region from 16:00–17:00 UT on 21 April 20...

    G. H. Share, R. J. Murphy, B. R. Dennis… in The Reuven Ramaty High-Energy Solar Spectr… (2003)

  3. No Access

    Article

    RHESSI Observation of Atmospheric Gamma Rays from Impact of Solar Energetic Particles on 21 April 2002

    The RHESSI high-resolution spectrometer detected γ-ray lines and continuum emitted by the Earth's atmosphere during impact of solar energetic particles in the south polar region from 16:00–17:00 UT on 21 April...

    G.H. Share, R.J. Murphy, B.R. Dennis, R.A. Schwartz, A.K. Tolbert… in Solar Physics (2002)

  4. No Access

    Article

    Gamma-Ray Line Observations of the 2000 July 14 Flare and SEP Impact on the Earth

    The HXS and GRS detectors on Yohkoh observed the 14 July 2000, X5.7 flare, beginning at ∼ 10:20 UT, ∼ 4 min before the peak in soft X-rays. The hard X-rays and γ-rays peaked ∼ 3 min later at ∼ 10:27 UT. Solar γ-r...

    G.H. Share, R.J. Murphy, A.J. Tylka, R.A. Schwartz, M. Yoshimori, K. Suga… in Solar Physics (2001)

  5. No Access

    Article

    Limits on Radiative Capture γ-Ray Lines and Implications for Energy Content in Flare-Accelerated Protons

    Measurements of radiative-capture γ-ray lines can provide information on both the energy content of nonthermal protons below 1 MeV and the temperature in the region where they interact. We have derived upper l...

    G.H. Share, R.J. Murphy, E.K. Newton in Solar Physics (2001)

  6. No Access

    Chapter

    Solar-Terrestrial and Terrestrial Science

    Ironically, one of the more predictable outcomes of a mission into new territory is the discovery of exciting science in places not targeted by the mission planners. Such was the case with the Solar Maximum Missi...

    J. M. Ryan, A. C. Aikin, E. W. Cliver, E. Rieger, G. H. Share in The Many Faces of the Sun (1999)

  7. No Access

    Chapter

    Cosmic Studies

    Prior to the launch of the Solar Maximum Mission (SMM), experimenters on the Hard X-Ray Burst Spectrometer (HXRBS) and Gamma-Ray Spectrometer (GRS) teams anticipated that their instruments would provide useful da...

    G. H. Share, C. Kouveliotou, R. Schwartz in The Many Faces of the Sun (1999)

  8. No Access

    Article

    BATSE/OSSE rapid burst response

    The BATSE and OSSE instrument teams have modified flight software to promptly (within 2 min of trigger) slew the OSSE detectors to burst locations determined on-board by BATSE. This enables OSSE to make sensit...

    S. M. Matz, J. E. Grove, W. N. Johnson, J. D. Kurfess… in Astrophysics and Space Science (1995)

  9. No Access

    Article

    Osse limits on pre- and post-burst emission

    The existence of either pre- or post-burst emission can provide substantial new information about the burst source and its local environment. We have data from serveral events serendipitously in or near the OS...

    S. M. Matz, J. E. Grove, W. N. Johnson, J. D. Kurfess… in Astrophysics and Space Science (1995)

  10. No Access

    Article

    Upper limit on the steady emission of the 2.223 MeV neutron capture γ-ray line from the Sun

    Data accumulated by the Solar Maximum Mission Gamma Ray Spectrometer (GRS) have been searched for evidence of the 2.223 MeV neutron capture line from the Sun, outside the times of γ-ray-emitting solar flares. ...

    M. J. Harris, G. H. Share, J. H. Beall, R. J. Murphy in Solar Physics (1992)

  11. No Access

    Article

    Gamma-ray line emission from SN1987A

    The gamma-ray spectrometer (GRS) on NASA's Solar Maximum Mission satellite (SMM) has observed a significant (>5δ) net line flux at ˜847 keV in the background-subtracted spectrum of SN1987A—accumulated between ...

    S.M. Matz, G.H. Share, M.D. Leising, E.L. Chupp, W.T. Vestrandt, W.R. Purcell… in Nature (1988)

  12. No Access

    Article

    A 154-day periodicity in the occurrence of hard solar flares?

    Since the launch of the Solar Maximum Mission (SMM) satellite on 1980 February 14, the Gamma-Ray Spectrometer (GRS)1 has been monitoring the Sun in the energy range 0.3–100 MeV. Because of its large geometric are...

    E. Rieger, G. H. Share, D. J. Forrest, G. Kanbach, C. Reppin, E. L. Chupp in Nature (1984)

  13. No Access

    Article

    Spectral feature of 31 December 1981 γ-ray burst not confirmed

    The emission lines reported at 400–500 keV in the spectra of γ-ray bursts1 have been interpreted as redshifted positron annihilation lines, and, together with the lower-energy cyclotron lines1, are the most direc...

    P. L. Nolan, G. H. Share, E. L. Chupp, D. J. Forrest, S. M. Matz in Nature (1984)

  14. No Access

    Article

    X-ray emission from γ-ray sources in the galactic anticentre region

    An X-ray survey of three high-energy γ-ray sources in the galactic anticentre region has been conducted using the large area sky survey (LASS) instrument on HEAO 1. The sensitivity of this survey ≲0.5 Uhuru flux ...

    G. H. Share, M. Bonnardeau, K. Wood, J. F. Meekins, D. J. Yentis, W. D. Evans… in Nature (1979)

  15. No Access

    Article

    GX339–4: a new black hole candidate

    THE large area survey instrument on HEAO 1 has observed that the galactic X-ray source GX339–4 (4U1658–48) varies on time scales from tens of milliseconds to hundreds of days. Its long term variability was kno...

    J. SAMIMI, G. H. SHARE, K. WOOD, D. YENTIS, J. MEEKINS, W. D. EVANS, S. SHULMAN… in Nature (1979)

  16. No Access

    Article

    Discovery of two cosmic X-ray bursts in 1970

    Two bursts of high-energy photons have been discovered during analysis of 2 1/2 years of data from NRL's solar X-ray detector on OSO-6. Both bursts were simultaneously observed by the OGO-5 hard X-ray spectrom...

    G. H. Share in Astrophysics and Space Science (1976)

  17. No Access

    Article

    Experiment to detect Pulsed γ-Rays from the Crab Nebula

    A BALLOON-BORNE experiment using a telescope sensitive to γ-radiation between 10 and 150 MeV was successfully flown on October 25, 1969, from Palestine, Texas, and was oriented to within 2° of the Crab Nebula....

    R. L. KINZER, R. C. NOGGLE, N. SEEMAN, G. H. SHARE in Nature (1971)