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"Sun Rising and setting."
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Why does the sun set?
Explains how the rising and setting of the sun is caused by the rotation of the Earth.
Book
Post-sunset rise of equatorial F layer—or upwelling growth?
According to the so-called upwelling paradigm, development of equatorial plasma bubbles (EPBs) involves (1) appearance of an upwelling (i.e., local uplift with a zonal width of ~ 400 km) in the bottomside of the equatorial F layer, (2) its growth via the F-region interchange instability during the post-sunset rise (PSSR) of the F layer, and (3) launching of EPBs, which starts near the end of PSSR, from within the confines of the upwelling. In this description, the PSSR is presumed to be the primary driver of the paradigm, with upwelling growth dependent on PSSR strength. As constructed, the paradigm describes EPB development when PSSR is strong (i.e., high solar activity), but not when it is weak. We, show, for the first time, that when PSSR is weak (e.g., low solar activity), upwelling growth can still be comparable in strength to what would be considered a strong PSSR, and that this growth drives EPB development. Given that EPBs do not develop outside of upwellings, regardless of solar activity, we are led to conclude, against mainstream thinking, that the controlling driver for EPB development is upwelling growth, not PSSR. For continued progress toward understanding EPB development, a crucial next step is to identify the source mechanism for upwelling growth, especially when PSSR is weak, and to better understand the complexities of the underlying physics.
Journal Article
Next time you see a sunset
Discusses the spinning of the Earth, the progress of day into night, and the reasons for the spectacular colors and shadows that accompany sunrise and sunset.
Book
Sun Rises Across Alaska at Last!
\"The Sun rose in Utqiaġvik, Alaska, on January 22 [2025]. That may not sound like a big deal. In fact, the Sun set just 52 minutes later. But it was the city’s first sunrise of the year! The residents of Utqiaġvik (oot-GHAR-vik) had not seen the Sun since November 18, 2024!\" (News-O-Matic) Read more about the rising sun in Alaska.
Web Resource
The night world
Sylvie the cat persuades her boy to go into the darkness very late at night, where they're greeted by the shadows of roses and other flowers, and by nocturnal animals who whisper, \"It's almost here.\"
Book
Solstice : around the world on the longest, shortest day
Explore the daily lives of children around the world through the lens of a single, special day - June 21st, the longest day of the year in the northern hemisphere and the shortest in the southern hemisphere.
CHILDBOOK