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  • Astrophysics  (1)
  • Space Radiation  (1)
  • 1
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    The Magnetic Roots of Enhanced Coronal Heating (1998)
    In:  Other Sources
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    Publication Date: 2019-07-17
    Description: Building a description of the sites of enhanced heating in the solar atmosphere has been a primary interest of the solar group at MSFC. For locations within and between active regions, as well as in the quiet Sun, this work shows that extended magnetic structures are heated from active compact magnetic structures at their feet. This talk will review what we have learned about the magnetic characteristics of these active footpoint sites, and the relationships of the intensity variations in the low-lying and higher structures, in the context of current theories and observations of magnetic reconnection and jets. One puzzling result is the poor correlation of intensity variations in the low and high loops.
    Keywords: Space Radiation
    Type: Solar Jets and Polar Plumes; Feb 23, 1998 - Feb 27, 1998; Pointe a Pitre; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Chandra Observations of Magnetic White Dwarfs and their Theoretical Implications (2003)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Observations of cool DA and DB white dwarfs have not yet been successful in detecting coronal X-ray emission, but observations of late-type dwarfs and giants show that coronae are common for these stars. To produce coronal X-rays, a star must have dynamo-generated surface magnetic fields and a well-developed convection zone. There is some observational evidence that the DA star LHS 1038 and the DB star GD 358 have weak and variable surface magnetic fields. It has been suggested that such fields can be generated by dynamo action, and since both stars have well-developed convection zones, theory predicts detectable levels of coronal X-rays from these white dwarfs. However, we present analysis of Chandra observations of both stars showing no detectable X-ray emission. The derived upper limits for the X-ray fluxes provide strong constraints on theories of formation of coronae around magnetic white dwarfs. Another important implication of our negative Chandra observations is the possibility that the magnetic fields of LHS 1038 and GD 358 are fossil fields.
    Keywords: Astrophysics
    Type: The Astrophysical Journal; 593; 481-485
    Format: text
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    NASA TECHNICAL REPORTS
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