The tail effectively becomes a windsock for measuring the speed of the solar wind. |
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It has long been known to the astronomical community that the fast solar wind comes from coronal holes. |
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They are weaker than cosmic and galactic rays, and tend to get buffeted around like clouds of manic dandelion spores on the solar wind. |
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We used this same technique when the instrument measuring the solar wind speed was still working. |
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Parker also showed how the solar wind would carry the solar magnetic field into interplanetary space. |
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The atoms become ionized by the sun's ultraviolet radiation and are then accelerated to enormous energies by the solar wind. |
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The ion and electron monitors were turned on several months ago in preparation for their role during solar wind collection. |
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Charged particles from the solar wind become trapped in the magnetosphere near the Earth's poles. |
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The solar wind also effects how cosmic rays reach the earth, which may have important consequences for earth weather and climate change. |
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By knowing how auroras react to the solar wind, scientists can better determine the impacts of space weather in the future. |
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The particles in the solar wind carry a charge, so they move along the field lines. |
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Now, observations show that Earth's outer atmosphere interacts dramatically with the solar wind and shields the planet from it. |
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As the solar wind from the sun flows out beyond Pluto, it collides with the material between the stars, forming a shock front. |
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The particles are discharged into space on the solar wind at a velocity of 1,000 kilometres per second. |
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With the brilliant disk of the Sun blocked, the faint light of the corona reveals streamers of solar wind blowing out into space. |
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Bolstering that view, simple models of the heliosphere require that the magnetic field intensifies in regions where the solar wind slows. |
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Voyager 1 has left the termination shock to enter the heliosphere, a region still influenced by the solar wind. |
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If the magnetic field in the solar wind is directed southward, it can interconnect with the Earth's northward-oriented magnetic field. |
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The two Voyagers are located in the outermost layer of the heliosphere, where the solar wind is slowed by the pressure of interstellar gas. |
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The solar wind is a stream of electrically charged particles blown constantly from the sun. |
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In our own solar system, the solar wind is responsible for shaping comets' tails and producing the Aurorae Borealis on Earth. |
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Although the solar wind produces beautiful auroras, it can also cause a variety of undesirable consequences. |
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A very powerful solar wind swept the uncondensed gas out of the Solar System and into the interstellar medium. |
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First, as a red giant star, it emitted a slow solar wind of ionized particles that streamed into space, as all stars do. |
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But comets are shaped and affected by the Sun and the solar wind, making them more like kin than aliens. |
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Saturn, its moons and highly structured rings live inside a huge cavity in the solar wind created by the planet's strong magnetic field. |
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At low energies, many of the particles themselves originate in solar flares, or are accelerated by shocks in the solar wind. |
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The Voyagers are examining the far reaches of the solar wind, a gusty flow of particles hurled outward by the Sun. |
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The charged particles of the solar wind disturb parts of the atmosphere, which causes interference. |
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Solar researchers have found that the electrified plasma of the solar wind flows out of the corona like water gushing through cracks in a dam. |
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That solar wind fluctuated in fast and slow bursts and had periods of 27 days, as Maunder had suggested 60 years before. |
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On hitting the solar wind, the interstellar particles pick up a charge, becoming pickup ions. |
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The lack of atmosphere also means there's no protection from harmful radiation in the solar wind. |
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The average strength of the magnetic field carried by the solar wind depends on solar location as well. |
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Figure 1: The solar corona and the solar wind observed by a SECCHI coronagraph on a STEREO probe. |
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The continuous solar wind creates auroras all year round, including summer. |
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On Earth, aurorae are caused by the interaction of solar wind particles with the planet's magnetic field. |
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Spacecraft located near the L1 libration point provide data on several characteristics of the solar wind. |
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The HST images were obtained during a campaign by the Cassini spacecraft to measure the solar wind approaching Saturn and the Saturn kilometric emissions. |
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The tail is pushed outwards from the Sun by the solar wind and radiation pressure, and so the popular conception that a comet's tail streams away behind it is wrong. |
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Its last assignment was to find the heliopause, where the solar wind is offset by the galactic wind, but in April 1997 it was passed by a younger, faster Voyager spacecraft. |
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When the charged particles of the solar wind hit the atmosphere, various gases present in the atmosphere heat up, split apart molecules, and ionize atoms. |
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Matter flowing outward from a star produces a stellar wind analogous to the solar wind, but one that is often much more extensive and violent. |
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Eventually the pressure of the solar wind becomes comparable to that of the interstellar medium. |
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Complex sunspot groups cause the eruption of solar flares, which produce a substantial release of solar particles into the solar wind. |
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The hydrodynamic models are based on local thermodynamic equilibrium, which is far from being true in the case of solar wind electrons. |
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Prominences and flares erupt into the atmosphere, releasing energy and particles into the corona and eventually extending into the solar wind. |
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And that's critical to the analysis of the solar wind, the particles of which contain infinitesimal traces of the 83 naturally occurring elements. |
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Solar wind power satellite, large hypothetical satellite that would harvest energy from solar wind. |
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A solar flare or high-speed solar wind stream creates a high-pressure region in the solar wind. |
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The solar wind in less than one million years ages their surface giving them a very old appearance. |
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Learn about solar storms and solar wind and how they affect our communications technology and the environment on Earth. |
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The tail drags behind the bullet-shaped heliosphere, or the bubble surrounding our solar system that's created by the solar wind and solar magnetic field. |
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The Moon's regolith was created by the ceaseless bombardment of micrometeorites, cosmic rays and particles of solar wind breaking down rocks for billions of years. |
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There are many other potential sources of natural resources in the solar system, including cosmic dust, solar wind, and the atmospheres of gas giant planets. |
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A magnetic field, if indeed it existed, would have shielded the planet from intense cosmic rays and solar wind, creating a more hospitable environment. |
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This rapid evolution supports the role of the solar wind as principal element in the transformation of their surfaces. |
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The samples of solar wind particles, collected on ultra-pure wafers of gold, sapphire, silicon and diamond were designed to be returned for analysis by Earth-bound scientists. |
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And how does the solar wind blow at a supersonic speed of nearly one thousand kilometres per second? |
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The pressure distribution within the magnetic barrier just outside the ionopause of Venus is shown here to be similar to expected solar wind pressure variation. |
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The flow of the solar wind around the Earth's magnetosphere is the ultimate power source for the aurora. |
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The solar wind has implanted hydrogen, helium, and other elements in the surfaces of fine grains of lunar soil. |
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Properties of the solar wind change depending on the phase of the 11-year solar activity cycle. |
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But no space probe is then in the immediate vicinity of Saturn there to measure the solar wind and to confirm this assumption. |
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In the case of the solar wind, V is the wind speed and B the interplanetary magnetic field. |
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This surface is deteriorated by the solar wind and the micrometeorites present in the interplanetary medium. |
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Rosetta's instruments will analyse the gases and dust grains in the coma that forms when the comet becomes active, as well as the interaction with the solar wind. |
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The planet's magnetic field, particularly the Van Allen radiation belt, acts as a shield to solar wind. |
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This suggests that any planet with a magnetic field will have a radiation belt or two of trapped solar wind particles. |
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Sunward of the magnetopause is the bow shock, the area where the solar wind slows abruptly. |
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As the solar wind speed increases, the magnetic field compresses on the sunward side while a long magnetotail points away from the Sun on the night side. |
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This approximates a pattern of Archimedean spiral in which the force of the solar wind is in the direction that all of the planets orbit. |
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Mars and Earth have comparable sidereal days, but Earth's magnetic field is strong enough to protect Earth from the solar wind, while that of Mars is not. |
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If the magnetospheric electric field remained steady, the particles drifting around the Earth would lose their energy on the dayside and convect to the magnetopause, where they would be lost to the solar wind. |
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We might think this balances the rotation-causing effect of the solar wind, even if done in an alternating and wobblesome way. |
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Also, because the tangential drag on the tail has increased, the tail current moves earthward to increase the force that the Earth exerts on the tail, thus balancing the additional force of the solar wind. |
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Both Voyager probes passed one waypoint years ago: the termination shock, a measurable barrier where the solar wind abruptly slows and an outer region called the heliosheath begins. |
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Figure 1: Artist view of the solar wind interacting with Saturn.s magnetosphere and causing variations of its « rotational clock » measured by the periodicity of its radio emissions. |
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Nevertheless European Space Agency scientists used this opportunity to make further measurements of Jupiter's magnetosphere and the effect upon it by the solar wind. |
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Geomagnetic storms occur when sunspots on the surface of the sun erupt and impact the Earth's magnetosphere, thereby disturbing solar wind and reducing the global magnetic field. |
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The law of physics says solar wind turbulence should not be affected by the speed and direction of that wind. |
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Dr Zhang says that the solar wind itself carries a magnetic field all the way to Venus where it encounters the planet's electrically charged upper atmosphere, or ionosphere. |
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The boundary separating Earth's magnetic sphere of influence from the solar wind is called the magnetopause. |
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The solar wind travels at supersonic speed until it crosses a shockwave called the termination shock. |
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This halo protects us from solar wind and space radiation. |
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The fast solar wind moves at about twice that speed. |
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For example, in the solar wind they interact with the Earth's magnetosphere giving rise to Birkeland currents and the aurora. |
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Beyond these, the exosphere thins out into the magnetosphere, where the geomagnetic fields interact with the solar wind. |
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Earth's magnetic field, predominantly dipolar at its surface, is distorted further out by the solar wind. |
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The solar wind exerts a pressure, and if it could reach Earth's atmosphere it would erode it. |
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The interaction between solar wind and the magnetosphere occurs at the border between the closed lines of terrestrial magnetic field and those which are open on the interplanetary medium. |
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These altitudes correspond to upper atmospheric sones where complex energy transfer between solar radiation, gravity wave dissipation coming from lower altitude regions and solar wind interaction take place. |
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They argue that the atmosphere of Mars may have been eroded away by the solar wind because it had no magnetic field to protect it. |
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There have been many studies of the Earth's magnetosphere and space weather, but these have never pinpointed exactly how the energy of the solar wind transforms explosively into auroras in the magnetosphere. |
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In general, the surface of the atmosphere-free small bodies of the solar system looks older through micrometeorite impacts, solar wind and cosmic rays. |
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The interaction of solar wind with the magnetosphere, producing auroras and other phenomena, and magnetohydrodynamic generation are covered next. |
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Satellites,, monitoring the solar wind can yield predictions up to an hour in advance. |
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Aurorae are caused by cosmic rays, solar wind and magnetospheric plasma interacting with the upper atmosphere. |
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That loss let the solar wind thin its atmosphere to the wraith which remains today. If this theory is correct, that process should still be happening. |
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The atoms that are shot off the surface of this planet by solar wind and micrometeoroid impacts create Mercury's exosphere. |
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The spacecraft will make a comprehensive study of the solar wind, utilizing dual lunar swingby orbits to sample regions close to and farther away from the Earth. |
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This finding agrees well with observations of white-light coronal-hole jets, and can explain microstreams and torsional Alfven waves detected in situ in the solar wind. |
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Because of its location, Mercury is also affected by the solar wind. |
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Lapland is so far north that the Aurora Borealis, fluorescence in the high atmosphere due to solar wind, is seen regularly in the fall, winter, and spring. |
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A cloud of them forms a stream of plasma known as the solar wind. |
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The radiation pressure of the solar wind then expelled most of the unaccreted matter, and only those planets with sufficient mass retained their gaseous atmosphere. |
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The core may include solid and liquid regions, and some planetary cores generate their own magnetic field, which can protect their atmospheres from solar wind stripping. |
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Since the atoms are such straight shooters, they should provide a highly accurate picture of which places on the moon are being most affected by solar wind. |
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Voyager 1 entered the heliospheric boundary region in 2004, passing beyond what's known as the termination shock where the solar wind abruptly slows. |
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Might it not be true, though, that this comet and others have periodically had lighter molecules swept away by the solar wind as they have neared the sun and formed tails? |
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The interaction of the solar wind and the interstellar medium is complicated by the presence of neutral hydrogen that is coupled via charge exchange to the plasma. |
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A solar wind of plasma particles constantly streams outward from the Sun until, at the outermost limit of the Solar System, it reaches the heliopause. |
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Just outside the termination shock is the heliosheath, where the solar wind continues to slow, reaching a stagnation region where solar wind speed drops to zero. |
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The aurora are created when solar wind particles are guided by the magnetic flux lines into the Earth's polar regions where the lines the descend into the atmosphere. |
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