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Interpretation of Electric fields in Coronal Magnetic Loops

Published online by Cambridge University Press:  12 April 2016

P. Foukal  and
D. Landman
P. Foukal
Affiliation:
Atmospheric and Environmental Research, Inc., Cambridge, MA 02139
D. Landman
Affiliation:
Atmospheric and Environmental Research, Inc., Cambridge, MA 02139

Extract

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Stark effect detected in high Balmer lines emitted from flares, prominences, and quiet chromosphere is generally interpreted as pressure broadening in a plasma of relatively high density. But a recent study of post-flare loops indicates that the densities of order 1012 cm−3 required to explain the observed Balmer line broadening are an order of magnitude higher than values derived using other plasma diagnostics such as Thomson scattering and Balmer line emission measures (Foukal, Miller, and Gilliam 1983). The disagreement might be explained as the difference expected between the true local density (measured by the Stark effect) in the obviously inhomogeneous loop plasma, and the straight mean or root mean square densities measured by Thomson scattering and line emission measures. More interestingly, the disagreement might imply a macroscopic electric field generated by, e.g., plasma waves in coronal magnetic loops.

Type
Session 1. Solar Astrophysics
Information
International Astronomical Union Colloquium , Volume 86: Eighth International Colloquium on Ultraviolet and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas , 1984 , pp. 25 - 28
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.

References

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