X-ray observations of sunspot penumbral structure

Details X-ray observations of sunspot penumbral structure X-ray observations of sunspot penumbral structure

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399..313s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 1, p. 313-317.

Astronomy and Astrophysics

Astronomy

39

Penumbras, Solar Magnetic Field, Solar X-Rays, Sunspots, Image Analysis, Magnetic Field Configurations, Solar Convection (Astronomy), X Ray Telescopes

Scientific paper

High-resolution coronal observations with the Normal Incidence X-ray Telescope (NIXT) reveal previously unobserved structure in the magnetic fields above a sunspot. The X-ray images are precisely aligned with a continuum photospheric image taken at the same time. The X-ray brightness traces magnetic field lines and shows: (1) that none of the bright loops originate in the spot umbra and (2) that some field lines emerging from the inner penumbra connect to regions far away from the spot. Such large-scale structures must remain distinct from the shallowly inclined fields in the outer penumbra. In particular, they cannot be involved in any interchange between the bright and dark filaments. This imposes constraints on models of penumbral convection.

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