{ "count": 5, "next": null, "previous": null, "results": [ { "id": 20320, "url": "https://svs.gsfc.nasa.gov/20320/", "result_type": "Animation", "release_date": "2020-08-14T09:00:00-04:00", "title": "Solar Energetic Particles", "description": "The Sun goes through phases of strong activity, during which eruptions can occur. Such eruptions can have multiple components, including X rays, coronal mass ejection plasma, and solar energetic particles – bursts or events of fast-moving particles. These events can occur suddenly and have the potential to rapidly change the radiation environment of wide swaths of the inner solar system where they may create hazardous conditions. Not only are such conditions dangerous for humans in space, but the intense ionizing radiation can also affect the interior of spacecraft, including sensitive electronics. Solar energetic particles can reach all regions of near-Earth space, including the lunar surface, with the exception of low-altitude and low-latitude Earth orbit, where the Earth’s magnetic field is strong enough to form a protective barrier. || ", "hits": 480 }, { "id": 4666, "url": "https://svs.gsfc.nasa.gov/4666/", "result_type": "Visualization", "release_date": "2018-07-27T00:00:00-04:00", "title": "Uranus' Magnetosphere", "description": "A basic view of the Uranian magnetosphere when the rotation axis is perpendicular to the Uranus-Sun line and days and nights are of equal duration. || Uranus_UranusEquinox_Dayside.slate_BaseRig.HD1080i.1500_print.jpg (1024x576) [197.1 KB] || Uranus_UranusEquinox_Dayside.slate_BaseRig.HD1080i.1500_searchweb.png (320x180) [107.3 KB] || Uranus_UranusEquinox_Dayside.slate_BaseRig.HD1080i.1500_thm.png (80x40) [6.8 KB] || UranusEquinox-noglyph (1920x1080) [0 Item(s)] || Uranus_UranusEquinox_Dayside.HD1080i_p30.webm (1920x1080) [20.9 MB] || Uranus_UranusEquinox_Dayside.HD1080i_p30.mp4 (1920x1080) [308.1 MB] || UranusEquinox-noglyph (3840x2160) [0 Item(s)] || Uranus_UranusEquinox_Dayside_2160p30.mp4 (3840x2160) [758.5 MB] || Uranus_UranusEquinox_Dayside.HD1080i_p30.mp4.hwshow [206 bytes] || ", "hits": 143 }, { "id": 4144, "url": "https://svs.gsfc.nasa.gov/4144/", "result_type": "Visualization", "release_date": "2017-07-12T10:00:00-04:00", "title": "Uranus' Magnetosphere", "description": "Earth's magnetic field creates a 'bubble' around Earth that helps protect our planet from some of the more harmful effects of energetic particles streaming out from the sun in the solar wind. Some of the earliest hints of this interaction go back to the 1850s with the work of Richard Carrington, and in the early 1900s with the work of Kristian Birkeland and Carl Stormer. That this field might form a type of 'bubble' around Earth was hypothesized by Sidney Chapman and Vincent Ferraro in the 1930s. The term 'magnetosphere' was applied to magnetic bubble by Thomas Gold in 1959. But it wasn't until the Space Age, when we sent the first probes to other planets, that we found clear evidence of their magnetic fields (though there were hints of a magnetic field for Jupiter in the 1950s, due to observations from radio telescopes). The Voyager program , two spacecraft launched in 1977, and successors to the Pioneer 10 and 11 missions, completed flybys of the giant outer planets. They became the implementation of the 'Grand Tour' of the outer planets originally proposed in the late 1960s. The Voyagers provided some of the first detailed measurments of the strength, extent and diversity of the magnetospheres of the outer planets.In these visualizations, we present simplified models of these planetary magnetospheres, designed to illustrate their scale, and basic features of their structure and impacts of the magnetic axes offset from the planetary rotation axes. The rotation axis of Uranus is tilted over ninety degrees relative to the revolution axis of the solar system, placing it roughly in the plane of the solar system. In addition, the magnetic axis has a large tilt relative to the rotation axis. These effects combine to not only give Uranus a more a more variable magnetosphere, but suggest the planet's magnetic field may be generated by a different mechanism than that of Earth, Jupiter and Saturn.For these visualizations, the magnetic field structure is represented by gold/copper lines. Some additional glyphs are provided to indicate some key directions in the field model.The Yellow arrow points towards the sun. The magnetotail is pointed in the opposite direction.The Cyan arrow represents the magnetic axis, usually tilted relative to the rotation axis. The arrow indicates the NORTH magnetic pole (convention has field lines moving north to south as the north pole of bar magnet (and compass pointer) points to the south magnetic pole).The Blue arrow represents the north rotation axis. It is part of the 3-D axis glyph (red, green, and blue arrows) included to make the planetary rotation more apparent.The semi-transparent grey mesh in the distance represents the boundary of the magnetosphere.Major satellites of the planetary system are also included. When appropriate for the time window of the visualization, the Voyager flyby trajectories are indicated.The models are constructed by combining the fields of a simple magnetic dipole, a current sheet (whose intensity is tuned match the scale of the magnetotail), and occasionally a ring current. This is a variation of the simple Luhmann-Friesen magnetosphere model. They are meant to be representative of the basic characteristics of the planetary magnetic fields. Some features NOT included are longitudes of magnetic poles to a standard planetary coordinate system and offsets of the dipole center from the planetary center. ReferencesT. Gold, Motions in the Magnetosphere of the EarthLuhmann & Friesen, A simple model of the magnetosphereMagnetic reconnection at Uranus' magnetopauseLASP: Polarity of planetary magnetic fieldsWikipedia: The Solar Storm of 1859Wikipedia: Kristian BirkelandWikipedia: Carl StørmerSpecial thanks to Arik Posner (NASA/HQ) and Gina DiBraccio (UMBC/GSFC) for helpful pointers on orientation of planetary rotation and magnetic axes. || ", "hits": 348 }, { "id": 3769, "url": "https://svs.gsfc.nasa.gov/3769/", "result_type": "Visualization", "release_date": "2010-09-30T12:00:00-04:00", "title": "IBEX Skymaps and the Bright Stars", "description": "In this image set, the brighter stars from the Tycho skymap have been reprojected into positions corresponding to the coordinate system used by the IBEX mission.The colors represent the number of neutral atoms (in the specified band of energies) detected by IBEX in each block of sky. Each block in the map is roughly a square about 6 degrees by 6 degrees (or the width of 12 full Moons, on a side). For the energy band displayed of 2.73 keV, violet corresponds to undetectable emission, while red corresponds to the detection of about 50 atoms per second per square centimeter in the angular segment of the sky. There is a 'hole' in the data (black) created when the IBEX scan cuts through the Earth's magnetotail.The images in this set have been co-registered for easy compositing. || ", "hits": 35 }, { "id": 3770, "url": "https://svs.gsfc.nasa.gov/3770/", "result_type": "Visualization", "release_date": "2010-09-30T12:00:00-04:00", "title": "IBEX Observes Changes in Heliopause Emission", "description": "The camera view moves from the heliosphere 'nose', the apparent direction of the heliopause relative to the interstellar wind, towards the 'knot'. The 'knot' represents a direction of high emission of neutral atoms which has changed significantly in the six months since the first IBEX map.We fade-in an artistic conception of the 'knot', which untangles during the six months as we fade to the second IBEX map. || ", "hits": 71 } ] }