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Magnetic fields in flares and active prominences

II: The field configuration in some active prominences

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Abstract

We study the longitudinal magnetic field in a number of active limb prominences showing fields in excess of 30 G. The objects fall into three groups: surges, caps and active region prominences. There appears to be an upper limit of 150–200 G for the field strength in prominences.

A model of surges is presented in which a pre-surge axi-symmetric magnetic field is established by a line current in the corona. We observe particle acceleration in surges that indicates v×B≠0 in these objects during periods comparable to the Alfvén transit time.

The strong fields observed in caps seem to run between parts of active regions in accordance with Hale's law of sunspot group polarities.

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Authors and Affiliations

  1. High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colo., U.S.A.

    E. Tandberg-Hanssen

  2. University of Colorado, Boulder, Colo, U.S.A.

    J. McKim Malville

Authors
  1. E. Tandberg-Hanssen
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  2. J. McKim Malville
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Additional information

Now at Space Sciences Laboratory, NASA-Marshall Space Flight Center, Alabama 35812.

The National Center for Atmospheric Research is sponsored by the National Science Foundation.

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Tandberg-Hanssen, E., McKim Malville, J. Magnetic fields in flares and active prominences. Sol Phys 39, 107–119 (1974). https://doi.org/10.1007/BF00154973

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  • DOI: https://doi.org/10.1007/BF00154973

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