aurora

Examples of aurora in the following topics:

• Aurora Borealis and the Aurora Australis

  • An aurora (plural aurorae or auroras; from the Latin word aurora forsunrise) is a natural light display in the sky, particularly in the high-latitude (arctic and antarctic) regions; it is caused by the collision of atmospheric atoms with energetic, charged particles coming from space.
  • An aurora is classified as either a diffuse or a discrete aurora.
  • Discrete auroras are sharply-defined features within the diffuse aurora; they vary in brightness from barely visible to bright enough for reading a newspaper at night.
  • Discrete auroras often display magnetic field lines or curtain-like structures.
  • The aurora borealis' southern counterpart, the aurora australis (or the southern lights), has almost identical features.

• Helical Motion

  • The motion of charged particles in magnetic fields are related to such different things as the Aurora Borealis or Aurora Australis (northern and southern lights) and particle accelerators.

• The Michelson Interferometer

  • It has played an important role in studies of the upper atmosphere, revealing temperatures and winds (employing both space-borne and ground-based instruments) by measuring the Doppler widths and shifts in the spectra of airglow and aurora.

• John Randolph and the Old Republicans

  • The radicals, led by William Duane, publisher of the Jeffersonian publication the Aurora, pushed for legislative reforms that would increase popular representation and the power of the poor and laboring classes.

• Geomagnetism

  • Frequently, Earth's magnetosphere is hit by solar flares causing geomagnetic storms, provoking displays of aurorae.

• Reproductive Isolation

  • (a) Rana aurora breeds earlier in the year than (b) Rana boylii.

• Magnetic Field Lines

  • For example, iron filings placed in a magnetic field line up to form lines that correspond to "field lines. " Magnetic fields' lines are also visually displayed in polar auroras, in which plasma particle dipole interactions create visible streaks of light that line up with the local direction of Earth's magnetic field.

• The First Crusade

  • Spurring them on had been a number of meteorological occurrences beginning in 1095 that seemed to be a divine blessing for the movement—a meteor shower, an aurorae, a lunar eclipse, and a comet, among other events.

• The Railroad Strikes

  • Soon, other railroads were brought to a standstill, with demonstrators shutting down railroad traffic in Bloomington, Aurora, Peoria, Decatur, Urbana, and other rail centers throughout Illinois.