By David G. Fisher, Richard R. Erickson
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Additional resources for The Solar System 3 vol set
This E × B drift in auroral ovals appears to be a major source of plasma for the magnetosphere. It appears that positively charged ions are accelerated upward along the same magnetic field lines, whereas negatively charged electrons precipitate downward. Hydrogen, helium, oxygen, and nitrogen ions compose this flow. Each ion has the same total energy, so their paths vary according to mass. The net effect is that of an ion Two curtain-patterned “dueling auroras,” as seen over the Yufountain blowing upward from the aukon in October, 2001.
The varying brightness of reflected sunlight from asteroids can be measured by photoelectric observations to determine their rotation periods and approximate shapes. 3-hour rotation. The size of an asteroid can be estimated from its brightness together with its distance, orbital position, and albedo. The albedo is important, since a bright, small object may reflect as much light as a dark, large object. Since a dark object absorbs more heat than a light object, albedos can be determined by comparing reflected light with thermal radiation measured by infrared radiometry.
This spurred interest in asteroid and comet impacts causing extreme environmental damage to the Earth at other times in the past, along with a desire to search for near-Earth asteroids that might represent a threat in the future. Twenty-five years after the proposal that an asteroid impact killed the dinosaurs received initial lukewarm acceptance by paleontologists; some researchers proposed that an even bigger asteroid (or comet) impact was responsible for the so-called Great Dying, the mass extinction at the end of the Permian period that closed out the Paleozoic era.
The Solar System 3 vol set by David G. Fisher, Richard R. Erickson