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29 cze 2024 · After invention of spectroheliographs and monochromatic filters, flares began to be observed much more often in Hα and some other chromospheric spectral lines.An Hα monochromatic image of a flare often shows two bright ribbons, the distance between which increases with time (Fig. 10.2).The area of emitting regions is from several millionths to several thousandths of the solar hemispheres.
23 godz. temu · The centimetre ( SI symbol: cm) is a unit of length in the metric system equal to 10−2 metres ( 1 100 m = 0.01 m ). To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimetres. 1 cm – 0.39 inches. 1 cm – edge of a square of area 1 cm 2.
29 cze 2024 · Tourism is a growing industry and significant generator of new jobs, which can benefit declining regions and play an important role in rural areas, where distinctive social and cultural heritage landscapes not only attract tourists, but also offer alternatives to mass tourism destinations (Gavrila-Paven et al., 2015; Irvine & Anderson, 2007).For this study, we define sustainable tourism as ...
