Spurious variation of photospheric magnetic flux

Details Spurious variation of photospheric magnetic flux Spurious variation of photospheric magnetic flux

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...176..139g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 176, no. 1, April 1987, p. 139-145.

Astronomy and Astrophysics

Astrophysics

25

Magnetic Flux, Photosphere, Solar Magnetic Field, Atmospheric Models, Iron, Line Spectra, Magnetic Signatures, Sunspots

Scientific paper

The response of a Babcock-type magnetograph to emission from different stages in the evolution of a solar active region is simulated by computing the Stokes I and V profiles of the 525.02-nm and 630.25-nm lines of Fe I in model atmospheres representing sunspot umbrae, magnetic knots, and magnetic elements. The results are presented in tables and graphs and characterized. Breakup of a single sunspot into small hot elements with the same total magnetic flux is shown to produce a significant (as much as factor of 10) spurious loss of signal in the magnetograph. It is suggested that recent observations of flux-loss events (in unipolar regions of the solar photosphere without magnetic neutral lines) be carefully reexamined and analyzed.

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