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Browsing by Author "Cranmer, S. R."

Browsing by Author "Cranmer, S. R."

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  • First Results from the SOHO Ultraviolet Coronagraph Spectrometer 
    Kohl, John L.; Noci, G.; Antonucci, E.; Tondello, G.; Huber, M. C. E.; Gardner, L. D.; Nicolosi, P.; Strachan, Leonard; Fineschi, S.; Raymond, John C.; Romoli, M.; Spadaro, D.; Panasyuk, A.; Siegmund, O. H. W.; Benna, C.; Ciaravella, A.; Cranmer, S. R.; Giordano, S.; Karovska, M.; Martin, R.; Michels, J.; Modigliani, A.; Naletto, G.; Pernechele, C.; Poletto, G.; Smith, Peter L. (1997)
    The SOHO Ultraviolet Coronagraph Spectrometer (UVCS/SOHO) is being used to observe the extended solar corona from 1.25 to 10 R? from Sun center. Initial observations of polar coronal holes and equatorial streamers are ...
  • Heating of the Solar Chromosphere and Corona by Alfvén Wave Turbulence 
    van Ballegooijen, Adriaan A.; Asgari-Targhi, Mahboubeh; Cranmer, S. R.; DeLuca, Edward E. (2011)
    A three-dimensional magnetohydrodynamic (MHD) model for the propagation and dissipation of Alfvén waves in a coronal loop is developed. The model includes the lower atmospheres at the two ends of the loop. The waves originate ...
  • A Model for the Stray-Light Contamination of the UVCS Instrument on SOHO 
    Cranmer, S. R.; Gardner, L. D.; Kohl, J. L. (2010)
    We present a detailed model of stray-light suppression in the spectrometer channels of the Ultraviolet Coronagraph Spectrometer (UVCS) on the SOHO spacecraft. The control of diffracted and scattered stray light from the ...
  • Modeling Iron Abundance Enhancements in the Slow Solar Wind 
    Byhring, H. S.; Cranmer, S. R.; Lie-Svendsen, Ø.; Habbal, Shadia R.; Esser, R. (2011)
    We have studied the behavior of Fe ions in the slow solar wind, using a fluid model extending from the chromosphere to 1 AU. Emphasis is on elemental "pileup" in the corona, i.e., a region where the Fe density ...
  • Prevalence of small-scale jets from the networks of the solar transition region and chromosphere 
    Tian, H.; DeLuca, Edward E.; Cranmer, S. R.; De Pontieu, B.; Peter, H.; Martínez-Sykora, J.; Golub, L.; McKillop, S.; Reeves, Katharine K.; Miralles, Mari Paz; McCauley, P.; Saar, S.; Testa, P.; Weber, Mark A.; Murphy, Nicholas A.; Lemen, J.; Title, A.; Boerner, P.; Hurlburt, N.; Tarbell, T. D.; Wuelser, J. P.; Kleint, L.; Kankelborg, C.; Jaeggli, S.; Carlsson, M.; Hansteen, V.; McIntosh, S. W. (2014)
    As the interface between the Sun's photosphere and corona, the chromosphere and transition region play a key role in the formation and acceleration of the solar wind. Observations from the Interface Region Imaging Spectrograph ...
  • The Solar Corona as Probed by Comet Lovejoy (C/2011 W3) 
    Raymond, John C.; McCauley, P. I.; Cranmer, S. R.; Downs, C. (2014)
    Extreme-ultraviolet images of Comet Lovejoy (C/2011 W3) from the Atmospheric Imaging Assembly show striations related to the magnetic field structure in both open and closed magnetic regions. The brightness contrast implies ...
  • The Spatial and Temporal Dependence of Coronal Heating by Alfvén Wave Turbulence 
    Asgari-Targhi, Mahboubeh; van Ballegooijen, Adriaan A.; Cranmer, S. R.; DeLuca, Edward E. (2013)
    The solar atmosphere may be heated by Alfvén waves that propagate up from the convection zone and dissipate their energy in the chromosphere and corona. To further test this theory, we consider wave heating in an active ...
  • Structure and Dynamics of the Accretion Process and Wind in TW Hya 
    Dupree, A. K.; Brickhouse, Nancy S.; Cranmer, S. R.; Berlind, P.; Strader, Jay; Smith, Graeme H. (2014)
    Time-domain spectroscopy of the classical accreting T Tauri star, TW Hya, covering a decade and spanning the far UV to the near-infrared spectral regions can identify the radiation sources, the atmospheric structure produced ...
  • Time-dependent Turbulent Heating of Open Flux Tubes in the Chromosphere, Corona, and Solar Wind 
    Woolsey, L. N.; Cranmer, S. R. (2015)
    We investigate several key questions of plasma heating in open-field regions of the corona that connect to the solar wind. We present results for a model of Alfvén-wave-driven turbulence for three typical open magnetic ...
  • TW Hya: Spectral Variability, X-Rays, and Accretion Diagnostics 
    Dupree, A. K.; Brickhouse, Nancy S.; Cranmer, S. R.; Luna, G. J. M.; Schneider, E. E.; Bessell, M. S.; Bonanos, A.; Crause, L. A.; Lawson, W. A.; Mallik, S. V.; Schuler, S. C. (2012)
    The nearest accreting T Tauri star, TW Hya was intensively and continuously observed over ~17 days with spectroscopic and photometric measurements from four continents simultaneous with a long segmented exposure using the ...
  • X-Ray Determination of the Variable Rate of Mass Accretion onto TW Hydrae 
    Brickhouse, Nancy S.; Cranmer, S. R.; Dupree, A. K.; Günther, H. M.; Luna, G. J. M.; Wolk, S. J. (2012)
    Diagnostics of electron temperature (T<SUB>e</SUB> ), electron density (n<SUB>e</SUB> ), and hydrogen column density (N <SUB>H</SUB>) from the Chandra High Energy Transmission Grating spectrum of He-like Ne IX in TW Hydrae ...

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