BOW SHOCK
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- Duration: 0:11
- Published: 08 Nov 2009
- Uploaded: 22 Aug 2010
- Author: suresh83chennai
Formation of bow shock wave in a supersonic wind tunnel at IIT Madras Gas dynamics lab in Aerospace Department
Bow Shock
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NASA
The National Aeronautics and Space Administration (NASA, ) is an Executive Branch agency of the United States government, responsible for the nation's civilian space program and aeronautics and aerospace research. Since February 2006, NASA's self-described mission statement is to "pioneer the future in space exploration, scientific discovery and aeronautics research."
http://wn.com/NASA
- Earth
- heliopause
- Heliosheath
- Herbig Haro objects
- interstellar medium
- magnetopause
- magnetosphere
- NASA
- Orion Nebula
- plasma physics
- R Hydrae
- Shock wave
- solar wind
- specific heat
- stellar wind
- Sun
- termination shock
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Shock Wave (Bow Shock) Formation on a Rectangular Prism
AUSM+-up scheme with supersonic inlet on the left side (~Ma 2), contours of density. Expansion waves on the trailing edge and bow shock formation are visible.
The day the Sun Changed
- Order: Reorder
- Duration: 3:22
- Published: 04 Jun 2009
- Uploaded: 09 May 2011
- Author: Chris2191970
For much of the 20th centruy and the period of modern observation in the space age our Sun has remained somewhat consistent . This event sticks out as the defining point of change in our local solar system in our time. The event itself lasted from May 10-12, 1999, the solar wind blowing towards the Earth from the Sun virtually disappeared .As the solar wind dissipated on May 11, 1999, the magnetosphere and bow shock around Earth expand to five times their normal size . Physicists were able to observe particles flowing directly from the Sun's corona to Earth. This severe change in the solar wind also changed the shape of Earth's magnetic field and produced an unusual auroral display at the North Pole. Starting late on May 10 and continuing through the early hours of May 12, NASA's ACE and Wind spacecraft each observed that the density of the solar wind dropped by more than 98%. Because of the decrease, energetic electrons from the Sun were able to flow to Earth in narrow beams, known as the strahl. Under normal conditions, electrons from the Sun are diluted, mixed, and redirected in interplanetary space and by Earth's magnetic field (the magnetosphere). But in May 1999, several satellites detected electrons arriving at Earth with properties similar to those of electrons in the Sun's corona, suggesting that they were a direct sample of particles from the Sun. The beams from the corona did not get broken up or scattered as they do under normal circumstances, and the <b>...</b>
Greetings From Jupiter ♪ ♫ Spooky Space Sounds
The signals in this sound file were acquired from Voyager 1s plasma wave instrument as the spacecraft approached the 'sonic boom' (or bow shock, as scientists refer to it) of Jupiter in 1979. A sonic boom is created as the solar wind, a thin stream of electrically charged gas from the sun, moves past the planets at supersonic speeds. The chirps heard at the beginning of the interval are waves generated by electrons coming from the bow shock and moving 'upstream' into the approaching solar wind. These soon die out and, except for a slight hum from one of the science instruments onboard and the firing of one of Voyager's thrusters (making a short thud), things become quiet. Then suddenly, the spacecraft enters the bow shock and is enveloped by the turbulence in this planetary 'sonic boom.'
Bow Shock, recorded live
- Order: Reorder
- Duration: 4:35
- Published: 19 Feb 2007
- Uploaded: 02 Aug 2010
- Author: Coloradorock
Recorded Live at Andolini's. Produced by Coloradorock for the "Innervision" television show broadcast weekly on PBS KDBI channel 12 in Colorado. ColoradoROCK has produced over 3000 high quality live recordings featuring over 25000 songs. For more info go to ColoradoROCK.com
THEMIS Explores the Earth's Bow Shock
- Order: Reorder
- Duration: 0:14
- Published: 15 Oct 2009
- Uploaded: 29 Apr 2011
- Author: borispetrovic
NASA/Goddard Space Flight Center Scientific Visualization Studio
MESSENGER Flies through Mercury's Magnetosphere
This animation shows a conceptual sketch of Mercury's magnetosphere at the time of the MESSENGER flyby. The graphs at the bottom show observations made by the Fast Imaging Plasma Spectrometer (FIPS) portion of the Energetic Particle and Plasma Spectrometer (EPPS) instrument as the spacecraft followed the indicated trajectory. The top plot depicts the low-energy plasma of solar wind origin, and the bottom plot shows heavy ion intensities associated with the planet. This flyby was the first survey of the ion plasma of Mercury's space environment. The positions at which the spacecraft first crossed the "bow shock" of the magnetospheric interaction with the solar wind, passed closest approach to the planet, and crossed the outbound bow-shock crossing are indicated. These results show the expected increases in solar wind plasma density downstream of the bow-shock boundary, as well as significant solar wind plasma densities within Mercury's magnetosphere close to the planet. The latter measurements provide definitive evidence that Mercury's magnetosphere -- despite its small size -- is not a vacuum but hosts significant densities of heated solar wind plasma. The plasma affects the magnetic field, contributes to the "space weathering" of the planet's surface, and sputters material from the surface to populate the exosphere. This first detection of heavy pick-up ions, Na+ and other species, near Mercury is consistent with their production by ionization of exospheric neutral <b>...</b>
Our Heliosphere, Sun, Comets, Earth and Connections
- Order: Reorder
- Duration: 3:55
- Published: 02 Jul 2009
- Uploaded: 24 Jan 2011
- Author: solarcradle
interplanetary magnetic field lines radiation heliosphere sun coronal mass ejection ionization ions tail comets coma plasma gases waveforms functions constellations magnetosphere, magnetotail van allen radiation belts plasmasphere polar cusps bow shock termination equatorial toroidal bands meteor calendar list cyclic seasons solar system cme solar flares sunspots auroral dipole oval displays gases elements space weather milky way galaxy oort clouds asteroid belt planets oxygen nitrogen hydroxyls sulfur salts amino acids .. atmospheres & environments
Solar WInd Virtualy Stops - Last Cycle of Mayan Calendar
- Order: Reorder
- Duration: 3:22
- Published: 16 Nov 2010
- Uploaded: 15 Jun 2011
- Author: 888Quetzalcoatl888
I reposted this video from Chris2191970 channel..many thanks dude ;o) For much of the 20th centruy and the period of modern observation in the space age our Sun has remained somewhat consistent . This event sticks out as the defining point of change in our local solar system in our time. The event itself lasted from May 10-12, 1999, the solar wind blowing towards the Earth from the Sun virtually disappeared .As the solar wind dissipated on May 11, 1999, the magnetosphere and bow shock around Earth expand to five times their normal size . Physicists were able to observe particles flowing directly from the Sun's corona to Earth. This severe change in the solar wind also changed the shape of Earth's magnetic field and produced an unusual auroral display at the North Pole. Starting late on May 10 and continuing through the early hours of May 12, NASA's ACE and Wind spacecraft each observed that the density of the solar wind dropped by more than 98%. Because of the decrease, energetic electrons from the Sun were able to flow to Earth in narrow beams, known as the strahl. Under normal conditions, electrons from the Sun are diluted, mixed, and redirected in interplanetary space and by Earth's magnetic field (the magnetosphere). But in May 1999, several satellites detected electrons arriving at Earth with properties similar to those of electrons in the Sun's corona, suggesting that they were a direct sample of particles from the Sun. The beams from the corona did not get broken <b>...</b>
Solar system in Milky way
Starting with a view of our Milky Way galaxy, the orange gas in the animation represents the interstellar medium. The bow shock is created because the heliosphere is moving through like a boat through the water, crashing through the interstellar gases. The bow shock in front of the moving heliosphere is similar to the one observed by the Hubble Space Telescope. Click for animation. Credit: NASA/Walt Feimer
![Zoom From The Milky Way Galaxy To Our Heliosphere [720p]](http://web.archive.org./web/20110904030926im_/http://i.ytimg.com/vi/I68mrePQytI/0.jpg "Zoom From The Milky Way Galaxy To Our Heliosphere [720p]")
Zoom From The Milky Way Galaxy To Our Heliosphere [720p]
- Order: Reorder
- Duration: 0:25
- Published: 16 Oct 2009
- Uploaded: 10 Mar 2011
- Author: djxatlanta
The Interstellar Boundary Explorer (IBEX) mission science team has used data from NASA's IBEX spacecraft to construct the first-ever all-sky map of the interactions occurring at the edge of the solar system, where the sun's influence diminishes and interacts with the interstellar medium. The interstellar boundary region shields our solar system from most of the dangerous galactic cosmic radiation that would otherwise enter from interstellar space. This is an updated version of an older animation. Starting with a view of our Milky Way galaxy, the orange gas in the animation represents the interstellar medium. The bow shock is created because the heliosphere is moving through like a boat through the water, crashing through the interstellar gases. Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio
DJ Nikki: a cover of Prince's Darling Nikki done reggae/jungle style
Celebrating the 25th anniversary of Prince "Purple Rain", Denver Dub Collective comes correct with all of "Purple Rain" in reggae, ska and dub. Here is Darling Nikki reworked as "DJ Nikki" in a reggae/Jungle style. Featuring Members of Judge Roughneck, Lion Souljah and Bow Shock.
Voyager Exploration of the Heliosphere
- Order: Reorder
- Duration: 0:15
- Published: 29 Apr 2011
- Uploaded: 29 Apr 2011
- Author: djxatlanta
This animated graphic shows the different streams of charged particles inside the bubble around our sun and outside, in the unexplored territory of interstellar space. In this schematic, our solar system is traveling to the left through the interstellar medium, molding our solar system into a comet-like shape. Our sun, in the center of the yellow circle, gives off a stream of charged particles known as the solar wind. The solar wind travels at supersonic speeds until it hits a border region known as the heliosheath, where the solar wind slows down and heats up. The heliosheath, where NASA's two Voyager spacecraft are now traveling, is shown in red. The shockwave boundary between the two regions is known as the termination shock. The pressure from the charged particles flowing between stars -- known as the interstellar flow -- forces the solar wind particles back down the tail of the comet-like shape. The boundary that separates an area dominated by interstellar charged particles rather than solar wind particles is known as the heliopause. The entire region from the heliopause inward is known as the heliosphere. There may also be a shockwave known as the bow shock -- like the bow shock of a boat cutting through water -- in front of our heliosphere. credit: NASA/JPL-Caltech source: photojournal.jpl.nasa.gov
Band 4 - Exploring the Universe.wmv
We are on the scene at the Jet Propulsion Laboratory in Pasadena, California, July 1976. The excited voices do not belong to actors but to controllers as they monitored the landing of the Viking spacecraft on Mars. The Voyager spacecraft which photographed Jupiter in 1979 penetrated a fierce wall of charged particles at the edge of the planets magnetic field the bow shock. We hear voyager hit the bow shock and we listen to Jupiters chirping dawn chorus. Now, outward-bound from the Solar System, we leave with actual radio pulses from stars and from a galaxy, M87, which some astronomers believe has a black hole at its center. The curiosity of Earthling about the Universe seems to know no limit. We hear a radio message which, in 1974, the Arecibo Observatory beamed in the direction of globular cluster M13 in the constellation Hercules more than 20000 light-years away. From a 1980 National Geographic recording.
Comet Encke tail discharges -- April 20, 2007 disconnect
- Order: Reorder
- Duration: 2:24
- Published: 01 Feb 2009
- Uploaded: 17 Aug 2010
- Author: solarcradle
CME, IMF, interplanetary magnetic fields, sector boundary, Mercury, Comet Encke 2007, planets, polar, polarity, reversal, planetary dipole, bow shock, irradiance, DE disconnect events, sun, comets, radiation, termination, charge, discharge, disconnect, reconnect, fluctuations, plasma mediums, absorb, adsorb, iononize, electron, neutrons, protons, auroral display, ionosphere, earth weather
Visualization of Mira Moving Through Space (2007.08.17)
- Order: Reorder
- Duration: 0:36
- Published: 08 Nov 2009
- Uploaded: 23 Jun 2011
- Author: djxatlanta
This artist's animation illustrates a star flying through our galaxy at supersonic speeds, leaving a 13-light-year-long trail of glowing material in its wake. The star, named Mira (pronounced my-rah) after the latin word for "wonderful," sheds material that will be recycled into new stars, planets and possibly even life. NASA's Galaxy Evolution Explorer discovered the long trail of material behind Mira during its survey of the entire sky in ultraviolet light. The animation begins by showing a close-up of Mira -- a red-giant star near the end of its life. Red giants are red in color and extremely bloated; for example, if a red giant were to replace our sun, it would engulf everything out to the orbit of Mars. They constantly blow off gas and dust in the form of stellar winds, supplying the galaxy with molecules, such as oxygen and carbon, that will make their way into new solar systems. Our sun will mature into a red giant in about 5 billion years. As the animation pulls out, we can see the enormous trail of material deposited behind Mira as it hurls along between the stars. Like a boat traveling through water, a bow shock, or build up of gas, forms ahead of the star in the direction of its motion. Gas in the bow shock is heated and then mixes with the cool hydrogen gas in the wind that is blowing off Mira. This heated hydrogen gas then flows around behind the star, forming a turbulent wake. Why does the trailing hydrogen gas glow in ultraviolet light? When it is heated <b>...</b>
September to December 2007 - Stereo A satellite - sun events - Pt 2
- Order: Reorder
- Duration: 5:22
- Published: 13 Oct 2008
- Uploaded: 19 Aug 2010
- Author: solarcradle
Stereo A HI satellite for September to December 2007. Sun, planets, comets, orbits, coronal ejection, solar irradiance, bow shock, calm year.
photo: NASA and the Hubble Heritage Team (STScI/AURA) file
1999/12/02 Orion Nebula and Bow Shock - Astronomers using NASA´s Hubble Space Telescope have found a bow shock around a very young star in the nearby Orion nebula, an intense star-forming region of gas and dust. A picture, from the Hubble Heritage
photo: NASA/JPL/University of Iowa
2004/07/01 Entering Saturn´s Magnetosphere with a Boom - This graph illustrates the series of sonic booms that took place when the Cassini spacecraft crossed Saturn´s bow shock. A bow shock is a shock wave located where incoming solar wind m
photo: Public Domain / NASA
Original NASA description: The Hubble Space Telescope imaged this view in February 1995. The arcing, graceful structure is actually a bow shock about half a light-year across, created from the wind from the star L.L. Orionis colliding with the Orion Nebula flow.
photo: Creative Commons / Liam Skoda
Modern recurve crossbow
photo: Nasa
PIA04927: Voyager Approaches Final Frontier (Nasa) KLeo
photo: Nasa
PIA04927: Voyager Approaches Final Frontier (Nasa) KLeo
photo: Creative Commons / Clipper
Cargo Vsl BadWeather
photo: US Coastguard / LT. MICHAEL MADYDA
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photo: Creative Commons
"Cupid fashioning a bow out of the club of Hercules", 1747-50.
photo: Creative Commons / Hayate
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Bow shock
A bow shock is the area between a magnetosphere and an ambient medium. For stars, this is typically the boundary between their stellar wind and the interstellar medium.
In a planetary magnetosphere, the bow shock is the boundary at which the speed of the solar wind abruptly drops as a result of its approach to the magnetopause. The best-studied example of a bow shock is that occurring where the solar wind encounters the Earth's magnetopause, although bow shocks occur around all magnetized planets. The Earth's bow shock is about 100-1000 km thick and located about 90,000 km (55,000 miles) from the Earth.
Description
The defining criterion is that the bulk velocity of the fluid (in this case, the solar wind) drops from "supersonic" to "subsonic", where the speed of sound in plasma physics is defined as
where cs is the speed of sound, is the ratio of specific heats, p is the pressure, and is the density of the plasma.
The particles making up the solar wind follow spiral paths along magnetic field lines. The velocity of each particle as it gyrates around a field line can be treated similarly to a thermal velocity in an ordinary gas, and in an ordinary gas, the mean thermal velocity is roughly the speed of sound. At the bow shock, the bulk forward velocity of the wind (which is the component of the velocity parallel to the field lines about which the particles gyrate) drops below the speed at which the particles are corkscrewing.
It is hypothesised that the Sun also has a bow shock as it travels through the interstellar medium, as shown in the figure. This will occur if the interstellar medium is moving supersonically towards the Sun, since the sun's solar wind is moving supersonically away from the Sun. The point where the interstellar medium becomes subsonic is the bow shock; the point where the interstellar medium and solar wind pressures balance is at the heliopause; the point where the solar wind becomes subsonic is the termination shock. According to Robert Nemiroff and Jerry Bonnell of NASA, the solar bow shock may lie at around 230 AU from the Sun.
Bow shocks are also a common feature in Herbig Haro objects, in which a much stronger collimated outflow of gas and dust from the star interacts with the interstellar medium, producing bright bow shocks that are visible at optical wavelengths.
The following images show further evidence of bowshock existence from dense gases and plasma in the Orion Nebula.
In 2006, a far infrared bow shock has been detected near the AGB star R Hydrae.
See also
Notes
References
External links
Category:Planetary science Category:Sun Category:Shock waves Category:Waves in plasmas
This text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
