By Neil Davis
Do iceworms devour ice? are you able to pay attention the aurora? How does mosquito repellent work? Why are Alaskan volcanoes calmly spaced alongside the coast? Is it attainable for warm water to freeze speedier than chilly water? the place are Alaska's greater than a hundred twenty five scorching springs? Why are northern twilights so long? Do glaciers slide or do they flow? Why do snowflakes flutter as they fall? In Alaska technology Nuggets, Neil Davis solutions those and plenty of different exciting questions within the interesting and informative type that makes him one among Alaska's favourite technological know-how writers. This compendium of approximately four hundred articles, together with articles by way of different members to a technology column carried by means of a number of Alaska newspapers, discusses phenomena as various because the northern lighting, permafrost, glaciers, meteorology, volcanoes, earthquakes, archaeology, Alaskan vegetation, mammoths, early people, and northerly living. Tourists and long-time Alaskans alike have made this much-loved ebook a bestseller for years. Alaska technological know-how Nuggets is a brilliant reference or present for an individual attracted to the outstanding traditional heritage of the North.
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Additional info for Alaska Science Nuggets (Natural History)
Over Alaska and western Canada, the needle hangs nearly vertically; there it is found that the strength of the field is nearly twice that at the equator. Using more sophisticated magnetometers that can be flown in aircraft, rockets and satellites, the earth's magnetic field also can be measured at all altitudes above the surface. The higher one goes the weaker becomes the magnetic field, but it maintains an orderly pattern of direction at all altitudes. However, at very high altitude a boundary is reached where it is evident that the magnetic field being measured is no longer that of the earth, but is instead that of the interplanetary medium which really is a weak extension of the sun's magnetic field.
The density of particles in the wind is only about one per cubic centimeter, a density considered on earth to be an excellent vacuum. Even though the solar wind has so few particles per unit volume, the wind has a profound effect upon the earth, especially at high latitudes. The earth's magnetic field interacts with the particles in the solar wind to deflect them away from the equatorial region. But at higher latitudes, they do move down into the high atmosphere. When they impact the atmospheric gases there they heat up the gases and Page 2 also create the visible aurora and electrical currents in the high atmosphere.
These currents induce secondary currents in the earth's surface where they can be easily measured. Despite the simplicity of the earth current recorder, it remains, down through Page 6 Divining the Aurora: Earth currents indicate overhead auroral activity. the years, as about the best method to tell when there is aurora overhead. It works day or night, whether the sky is cloudy or clear. Anyone interested in building an auroral alarm system using the earth current technique should contact us for a few additional hints on how to make the system work best.