Consistent determination of quasi force-free magnetic fields from observations in solar active regions

Details Consistent determination of quasi force-free magnetic fields from observations in solar active regions Consistent determination of quasi force-free magnetic fields from observations in solar active regions

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...356..301b&link_type=abstract

Astronomy and Astrophysics, v.356, p.301-307 (2000)

Astronomy and Astrophysics

Astrophysics

5

Sun: Activity, Sun: Magnetic Fields

Scientific paper

The classical concept of extrapolating the photospheric magnetic field from line-of-sight measurements Bl assuming a pure force-free field is revisited and a new procedure is proposed which is based on: [1)] non-vanishing magnetic forces, [2)] known horizontal forces from direct measurement of pressure or a related quantity (continuum brightness), [3)] a small perturbation to the potential or linear force-free field which matches the Bl distribution. Orders of magnitude are estimated from observational data and they show that magnetic forces should be actually as large as expected from dimensional analysis.

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