Free-fall Downflow Observed in HE I 1083.0 Nanometers and Hβ

Details Free-fall Downflow Observed in HE I 1083.0 Nanometers and Hβ Free-fall Downflow Observed in HE I 1083.0 Nanometers and Hβ

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...544..567s&link_type=abstract

The Astrophysical Journal, Volume 544, Issue 1, pp. 567-571.

Astronomy and Astrophysics

Astronomy

8

Sun: Atmospheric Motions, Sun: Chromosphere, Sun: Infrared

Scientific paper

In a short time sequence of simultaneously observed slit spectra of He I 1083.0 nm and Hβ we find the signature of material flowing toward the solar surface with up to 42 km s-1, in addition to material which is almost at rest. The constant acceleration of the moving material is about 200 m s-2. These multiple velocities occur in a small region of about 5'' in a plage region. We observe a highly dynamical phenomenon which lasts a few minutes. The duration and constant acceleration suggest free fall of matter unobstructed by magnetic structures or along vertical field lines.

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