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- W1976529596 abstract "We examine spectra of the Ca ii H line, obtained under good seeing conditions with the VTT Echelle Spectrograph in 2007 June, and higher resolution data of the Ca ii λ8542 line from Fabry–Pérot instruments. The VTT targets were areas near disk center which included quiet Sun and some dispersed plage. The infrared data included quiet Sun and plage associated with small pores. Bright chromospheric network emission patches expand little with wavelength from line wing to line center, i.e., with increasing line opacity and height. We argue that this simple observation has implications for the force and energy balance of the chromosphere, since bright chromospheric network emission is traditionally associated with enhanced local mechanical heating which increases temperatures and pressures. Simple physical considerations then suggest that the network chromosphere may not be able to reach horizontal force balance with its surroundings, yet the network is a long-lived structure. We speculate on possible reasons for the observed behavior. By drawing attention to a potential conundrum, we hope to contribute to a better understanding of a long-standing unsolved problem: the heating of the chromospheric network." @default.
- W1976529596 created "2016-06-24" @default.
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- W1976529596 date "2010-08-13" @default.
- W1976529596 modified "2023-09-27" @default.
- W1976529596 title "A CHROMOSPHERIC CONUNDRUM?" @default.
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- W1976529596 doi "https://doi.org/10.1088/0004-637x/720/1/776" @default.
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