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a gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun

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References in periodicals archive ?
The chromospheres are a chemical agent applied topically or administered orally.
The chlorination of TL and BL water samples including NOM resulted in decreasing UV absorbance at all wavelengths due to the destruction of UV-absorbing chromospheres and produced characteristic UV spectra.
Curiously the few examples studied so far seem to have not steady-state chromospheres (and so forth) but do experience occasional rather weak X-ray flares.
Most critically, what puts the energy up there in the chromosphere and corona?
The second possible interaction mechanism is the thermal mechanism; a noticeable fraction of the excitation energy is inevitably (as is certain to happen) converted to heat, which causes a local transient increase in the temperature of the absorbing chromospheres. Any appreciable time averaged heating of the sample can be prevented by controlling the irradiation intensity and dose appropriately.
The types and quantities of these chromospheres are also under genetic control, varying from one species to the other as well as from strain to others [32].
IST), while examining the sun's lower atmospheric layer just above the surface, called chromospheres, scientists observed a moderate flare, labelled an M-class flare, which is the second strongest class of flare after X-class, as ( reported by NASA.
Boundary conditions on model solar chromospheres. Solar Phys., 1969, v.
The chromosphere also supports weak continuous emission.
Cool stars, on the other hand, often have chromospheres and coronas with temperatures in the UV-emitting range, as indeed does the Sun.
Immediately after removal from the water bath, the test tubes were cooled in ice bath and 4 ml toluene was added to separate chromospheres. The absorbance was read in a spectrophotometer at 520 nm, as indicated by Bates [4].
Eddington recognized the great spatial extent of the chromosphere and pondered on how this material was supported [9, p.
In order to further increase this scale height to the levels observed, it was hypothesized that the chromosphere had to be heated, either through turbulent motion, wave motion, magnetic fields, or 5-minute oscillations [277, p.
Bhatnagar outlines that "Between the upper layer of the chromosphere and corona (although the demarcation is not sharp) lies the 'transition layer ', where the temperature rises very steeply, from about 25 000 to 500 000 K in height difference of just 1 000 km " expanding the extent of the transition region by a factor of 10 [8, p.
Harold Zirin, in candid fashion, reminds his readers that anyone with a ruler can establish that the chromosphere can attain elevations of at least 5 000 km from H[alpha] emissions [9].