Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh21b01k&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH21B-01 INVITED
Physics
7507 Chromosphere, 7524 Magnetic Fields, 7599 General Or Miscellaneous, 7851 Shock Waves
Scientific paper
The quiet solar chromosphere shows two characteristic signatures: an emission spectrum, and oscillations with periods that depend on the magnetic field. For the general emission spectrum, two fundamentally different empirical models have been proposed. The first, which is based on the observed time-average spectrum, has a positive temperature gradient outward and is always hot. The intensity variations caused by the dynamics are accounted for by temperature variations of relatively low amplitude (δ T/T ~ 0.1). The second model, which is based on the observed dynamics and applies only to the part of the medium in which magnetic fields are dynamically unimportant, is heated intermittently by shocks. This model is cool most of the time and has temperature excursions above the cool background that can be very large (δ T/T ~10). A complete description of the quiet chromosphere contains aspects of both models. This time-dependent model is always hot and has temperature variations of relatively low amplitude on the background of an atmosphere with a positive temperature gradient in the outward direction.
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