3/8/2023 0 Comments Comet tail artifact meaning![]() ![]() The medical intensive care unit of a university-affiliated teaching hospital. We asked whether lung ultrasound could be of any help in this situation. Retrieved January 31, 2013.Pneumothorax can be missed by bedside radiography, and computed tomography is the current alternative. "Venus Can Have 'Comet-Like' Atmosphere". ^ "Comet C/2009 R1 (McNaught) - Animation & Images"."The Heliospheric Imagers Onboard the STEREO Mission". "The plasma tails of comets and the interplanetary plasma". "Encounter of the Ulysses Spacecraft with the Ion Tail of Comet MCNaught". "The Mauna Kea-Cerro-Tololo (MKCT) Kuiper Belt and Centaur Survey". "An Analysis of the Statistics of the Hubble Space Telescope Kuiper Belt Object Search". "The Calibration of the Hubble Space Telescope Kuiper Belt Object Search: Setting the Record Straight". "The Discovery of Halley-sized Kuiper Belt Objects Using the Hubble Space Telescope". (This is similar to the formation of planetary magnetospheres.) The field lines "drape" around the comet forming the ion tail. In this bow shock, large concentrations of cometary ions (called "pick-up ions") congregate and act to "load" the solar magnetic field with plasma. facing the Sun), in the flow direction of the solar wind. ![]() The comet is supersonic relative to the solar wind, so a bow shock is formed upstream of the comet (i.e. The comet and its induced magnetic field form an obstacle to outward flowing solar wind particles. Once the particles have been ionised, they form a plasma which in turn induces a magnetosphere around the comet. The ion tail is the result of ultraviolet radiation ejecting electrons off particles in the coma. The observation of antitails contributed significantly to the discovery of solar wind. Evidence of the encounter was published in the October 1, 2007, issue of The Astrophysical Journal. The Ulysses spacecraft made an unexpected pass through the tail of the comet C/2006 P1 (Comet McNaught), on February 3, 2007. While the solid nucleus of comets is generally less than 30 km across, the coma may be larger than the Sun, and ion tails have been observed to extend 3.8 astronomical units (570 Gm 350 × 10 ^ 6 mi). Parallax viewing from the Earth may sometimes mean the tails appear to point in opposite directions. The ion tail follows the magnetic field lines rather than an orbital trajectory. At the same time, the ion tail, made of gases, always points along the streamlines of the solar wind as it is strongly affected by the magnetic field of the plasma of the solar wind. The tail of dust is left behind in the comet's orbit in such a manner that it often forms a curved tail called the antitail, only when it seems that it is directed towards the Sun. The streams of dust and gas each form their own distinct tail, pointing in slightly different directions. The streams of dust and gas thus released form a huge, extremely tenuous atmosphere around the comet called the coma, and the force exerted on the coma by the Sun's radiation pressure and solar wind cause an enormous tail to form, which points away from the Sun. As a comet approaches the inner Solar System, solar radiation causes the volatile materials within the comet to vaporize and stream out of the nucleus, carrying dust away with them. Statistical detections of inactive comet nuclei in the Kuiper belt have been reported from the Hubble Space Telescope observations, but these detections have been questioned, and have not yet been independently confirmed. In the outer Solar System, comets remain frozen and are extremely difficult or impossible to detect from Earth due to their small size. A comet's orbit showing the different directions of the gas and dust tails as the comet passes the Sun ![]()
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