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https://www.fcc.gov/media/radio/am-critical-hours
Mar 22, 2016 · For AM broadcast stations, the term critical hours refers to the time periods of sunrise to two hours after sunrise, and two hours before sunset to sunset. During these periods, the ionosphere has commenced its transition from daytime to nighttime conditions (or vice versa), resulting in greater coverage than would be expected from a daytime-only analysis.Estimated Reading Time: 2 mins
https://www.jstor.org/stable/j.ctv1xx9ks4
Critical Hours. Book Description: A misread map, a sudden storm, a forgotten headlamp-and suddenly a leisurely hike turns into a treacherous endeavor. In the past decade, inexpensive but sophisticated navigation devices and mobile phones have led to alarming levels of overconfidence on the trail. Adding to this worrisome trend, the increasing ...
https://www.barnesandnoble.com/w/critical-hours-sandy-stott/1127260017
Apr 03, 2018 · Sandy Stott, the “Accidents” editor at the journal of the Appalachian Mountain Club, delivers both a history and a celebration of the search and rescue workers who save countless lives in the White Mountains—along with a plea for us not to take their steadfastness and bravery for granted. Filled with tales of astonishing courage and sobering tragedy, Critical Hours will appeal to outdoor …Brand: University Press of New England
https://www.amazon.com/Critical-Hours-Search-Rescue-Mountains/dp/1512600407
Filled with tales of astonishing courage and sobering tragedy, Critical Hours will appeal to outdoor enthusiasts and armchair adventurers alike.4.5/5(57)
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