Anakin

They are:. See for example, Listening to Leonids (NASA, 2001) for details and references on the auditory phenomenon. Anakin is the name of two fictional characters in the Star Wars universe. Curiously, although the waves are electromagnetic, they can be heard: they are powerful enough to make grasses, plants, eyeglass frames, frizzy hair and other materials vibrate. Named after his maternal grandfather, Anakin Skywalker. As the trail dissipates, megawatts of electromagnetic energy can be released, with a peak in the power spectrum at audio frequencies. Son of Han Solo and Leia Organa. Large meteoroids can leave behind very large ionization trails, which then interact with the Earth's magnetic field.

Anakin Solo - A Jedi character in the Star Wars Expanded Universe. Meteor radars can measure atmospheric density and winds by measuring the decay rate and Doppler shift of a meteor trail. Father of Luke Skywalker and Leia Organa. Snowpack information from the Sierra Nevada mountains in California is transmitted from remote sites via meteor scatter. Anakin Skywalker - The Jedi who became Darth Vader, Dark Lord of the Sith. Amateur radio operators sometimes use meteor scatter communication on VHF bands. Because the sporadic nature of meteor entry, such systems are limited to low data rates, typically 459600 baud.

Security arises from the fact that as a mirror, only receivers in the correct position will hear the transmitter, much as with a real mirror, what is seen in reflection depends upon one's position with respect to the mirror. The basic idea of such a system is that such an ion trail will act as a mirror for radio waves, which can be bounced off the trail. Meteor scatter has been used for experimental secure military battlefield communications systems. When radio waves are bounced off these trails, it is called meteor scatter communication.

Small, sand-grain sized meteoroids are entering the atmosphere constantly, essentially every few seconds in a given region, and thus ionization trails can be found in the upper atmosphere more or less continuously. Such ionization trails can last up to 45 minutes at a time. During the entry of a meteoroid into the upper atmosphere, an ionization trail is created, where the molecules in the upper atmosphere are ionized by the passage of the meteor. These particles might affect climate, both by scattering electromagnetic radiation and by catalyzing chemical reactions in the upper atmosphere.

Meteor dust particles left by falling meteoroids can persist in the atmosphere for up to several months. Molten terrestrial material "splashed" from such a crater can cool and solidify into an object known as a tektite. A meteor striking the Earth or other object may produce an impact crater. If a meteoroid survives its transit of the atmosphere to come to rest on the surface, the resulting object is called a meteorite.

The meteor section of the British Astronomical Association on the other hand has a much stricter definition, requiring the meteor to be magnitude -5 or brighter. The International Meteor Organisation defines fireballs as being meteors of magnitude -3 or brighter. A very bright meteor may be called a fireball or bolide. Since the majority of meteors are from small sand-grain size meteoroid bodies, most visible signatures are caused by dexcitation following the individual collisions between vaporized meteor atoms and atmospheric constituents.

For bodies with a size scale larger than the atmospheric mean free path (10 cm to several meters) the visibility is due to the heat produced by the ram pressure (not friction, as is commonly assumed) of atmospheric entry. A meteor is the visible path of a meteoroid that enters the Earth's (or another body's) atmosphere, commonly called a shooting star or falling star.