Paschen-line Stark-broadening as an electric field diagnostic in erupting prominences

Details Paschen-line Stark-broadening as an electric field diagnostic in erupting prominences Paschen-line Stark-broadening as an electric field diagnostic in erupting prominences

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..114...65f&link_type=abstract

Solar Physics, Volume 114, Issue 1, pp.65-73

Physics

2

Scientific paper

We analyse the Stark broadening of the Balmer and Paschen lines emitted in two bright eruptive prominences, to determine the total electric field in these structures. We show that the Paschen lines provide a significantly more sensitive and accurate electric field indicator than the Balmer lines used previously in such studies. In the two eruptive events analysed here, the total electric fields agree to within 5 10 V cm-1 with the pressure-broadening fields expected from local densities of the cool plasma, measured simultaneously and co-spatially by a line-ratio diagnostic. We conclude that in such structures the upper limit to any widespread macroscopic fields is roughly 10 V cm-1 or less. This is in agreement with the motional electric field that might be associated with reconnection at the observed rate of the prominences' outward motion of about 135 km s-1.

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