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Coronal Streamer
Helmet streamers, also known as coronal streamers, are elongated cusp-like structures in the Sun's corona which are often visible in white-light coronagraphs and during solar eclipses. They are closed magnetic loops which lie above divisions between regions of opposite magnetic polarity on the Sun's surface. The solar wind elongates these loops to pointed tips which can extend a solar radius or more into the corona. During solar minimum, helmet streamers are found closer to the heliographic equator, whereas during solar maximum they are found more symmetrically distributed around the Sun. Structure Helmet streamers have cusp-like bases that taper radially outward away from the Sun forming long stalks. The base typically extends up to 1.5 solar radii above the surface, whereas the stalk—stretched outward by the solar wind—can extend over many solar radii. Helmet streamers are structured by closed magnetic fields and lie above boundaries separating opposite magnetic polarity ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helmet Streamers At Max
A helmet is a form of protective gear worn to protect the Human head, head. More specifically, a helmet complements the skull in protecting the human brain. Ceremonial or symbolic helmets (e.g., a Custodian helmet, policeman's helmet in the United Kingdom) without protective function are sometimes worn. Soldiers wear combat helmets, often made from Kevlar or other lightweight synthetic fibers. The word ''helmet'' is derived from ''helm'', an Old English word for a protective head covering. Helmets are used for most sports (e.g., jockeys, football helmet, American football, Hockey helmet, ice hockey, Cricket helmet, cricket, Batting helmet, baseball, skiing, hurling and rock climbing); dangerous work activities such as construction, mining, riot police, military aviation, and in transportation (e.g. motorcycle helmets and bicycle helmets). Since the 1990s, most helmets are made from resin or plastic, which may be reinforced with fibers such as aramids. Designs Some British gameke ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coronal Holes
Coronal holes are regions of the Sun's corona that emit low levels of ultraviolet and X-ray radiation compared to their surroundings. They are composed of relatively cool and tenuous plasma permeated by magnetic fields that are open to interplanetary space.Freedman, Roger A., and William J. Kaufmann III. "Our Star, the Sun." Universe. 8th ed. New York: W.H. Freeman, 2008. 419–420. Print. Compared to the corona's usual closed magnetic field that arches between regions of opposite magnetic polarity, the open magnetic field of a coronal hole allows solar wind to escape into space at a much quicker rate. This results in decreased temperature and density of the plasma at the site of a coronal hole, as well as an increased speed in the average solar wind measured in interplanetary space. Streams of fast solar wind originating from coronal holes can interact with slow solar wind streams to produce corotating interaction regions. These regions can interact with Earth's magnetosphere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coronal Loop
In solar physics, a coronal loop is a well-defined arch-like structure in the Sun's Stellar atmosphere, atmosphere made up of relatively dense Plasma (physics), plasma confined and isolated from the surrounding medium by magnetic flux tubes. Coronal loops begin and end at two footpoints on the photosphere and project into the Solar transition region, transition region and lower Solar corona, corona. They typically form and dissipate over periods of seconds to days and may span anywhere from in length. Coronal loops are often associated with the strong magnetic fields located within active regions and sunspots. The number of coronal loops varies with the 11 year solar cycle. Origin and physical features Due to a natural process called the solar dynamo driven by heat produced in the Sun's core, convective motion of the electrically conductive plasma (physics), plasma which makes up the Sun creates electric currents, which in turn create powerful magnetic fields in the Sun's inte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Solar Cycles
Solar cycles are nearly periodic 11-year changes in the Sun's activity that are based on the number of sunspots present on the Sun's surface. The first solar cycle conventionally is said to have started in 1755. The source data are the revised International Sunspot Numbers (ISN v2.0), as available at SILSO. Sunspot counts exist since 1610 but the cycle numbering is not well defined during the Maunder minimum. It was proposed that one cycle might have been lost in the late 18th century, but this remains not fully confirmed. Solar cycles can be reconstructed indirectly, using the radiocarbon Carbon-14, C-14, C or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Its presence in organic matter is the basis of the radiocarbon dating method pioneered by Willard Libby and coll ... 14C proxy, for the last millennium. The smoothing is done using the traditional SIDC smoothing algorithm. Using this algorithm, if the month i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PROBA2
PROBA-2 is the second satellite in the European Space Agency's series of PROBA low-cost satellites that are being used to validate new spacecraft technologies while also carrying scientific instruments. PROBA-2 is a small satellite (130 kg) developed under an ESA General Support Technology Program (GSTP) contract by a Belgian consortium led by Verhaert (now QinetiQ Space) of Kruibeke, Belgium. The nominal mission duration was two years. As of 2022, the mission continues. Mission summary It was launched on 2 November 2009, with the Rockot launch system together with ESA's SMOS mission. The platform was launched in a Sun-synchronous orbit low Earth orbit (altitude of 725 km). PROBA-2 contains five scientific instruments. Two of them are designated to observe the Sun: "The Sun Watcher using APS and Image Processing" ( SWAP, an EUV imager) and the "Large Yield Radiometer" (LYRA), a radiometer made of diamond photodiodes. The Principal investigator teams of both instrume ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetic Topology
In plasma physics, the magnetic topology of a plasma is the structure and linkage of its magnetic field. The magnetic topology of a plasma can be changed through magnetic diffusion and reconnection Magnetic reconnection is a physical process occurring in electrically conducting Plasma (physics), plasmas, in which the magnetic topology is rearranged and magnetic energy is converted to kinetic energy, thermal energy, and particle accelerati .... In the limit of a large magnetic Reynolds number, however, diffusion and reconnection of the magnetic field cannot occur, and the magnetic topology is preserved. See also * Helmet streamer#Pseudostreamers References {{Plasma-stub Plasma theory and modeling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Dynamics Observatory
The Solar Dynamics Observatory (SDO) is a NASA mission which has been observing the Sun since 2010. Launched on 11 February 2010, the observatory is part of the Living With a Star (LWS) program. The goal of the LWS program is to develop the scientific understanding necessary to effectively address those aspects of the connected Sun–Earth system directly affecting life on Earth and its society. The goal of the SDO is to understand the influence of the Sun on the Earth and near-Earth space by studying the solar atmosphere on small scales of space and time and in many wavelengths simultaneously. SDO has been investigating how the Sun's magnetic field is generated and structured, how this stored magnetic energy is converted and released into the heliosphere and geospace in the form of solar wind, energetic particles, and variations in the solar irradiance. General The SDO spacecraft was developed at NASA's Goddard Space Flight Center in Greenbelt, Maryland, and launched ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CC BY Icon
CC, cc, or C-C may refer to: Arts, entertainment, and media Fictional characters * C.C. (''Code Geass''), a character in the ''Code Geass'' anime series, pronounced "C-two" * C.C. Babcock, a character in the American sitcom ''The Nanny'' * Comedy Chimp, a character in ''Sonic Boom'', called "CC" by Doctor Eggman Gaming * ''Command & Conquer'' (''C&C''), a series of real-time strategy games and the first game in the series * Crowd control (video gaming), the ability to limit the number of mobs actively fighting during an encounter Other arts, music, entertainment, and media * Cannibal Corpse, an American death metal band. * CC Media Holdings, the former name of iHeartMedia * Closed captioning, a process of displaying text on a visual display, such as a TV screen * Comedy Central, an American television network (URL is cc.com) * '' Creative Camera'', defunct British photography magazine * "Cc", a song by Ecco2K from his album '' E'' Brands and enterprises Food and drink * C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parker Solar Probe Encounters Streamers On The Way To The Sun
Parker may refer to: People * Parker (given name), including a list of people and fictional characters with the given name * Parker (surname), including a list of people and fictional characters with the surname Arts and entertainment * ''Parker'' (1984 film), a British crime film * ''Parker'' (2013 film), an American action thriller * Parker, a player of park golf Businesses and organizations *Parker Brothers, former toy and game manufacturer * Parker Bros., former American firearms firm *Parker Guitars, American manufacturer of guitars *Parker Hannifin, manufacturer of motion and control technologies * Parker Manufacturing Company, tool and kitchen cabinet manufacturer, and industrial landlord *Parker Pen Company, American pen maker Places *Parker, Arizona *Parker, Colorado *Parker, Florida *Parker, Idaho *Parker, Kansas *Parker, Missouri *Parker, North Carolina *Parker, Pennsylvania * Parker, South Carolina * Parker, South Dakota *Parker, Texas in Collin County *Parker, Joh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Cycle 23
Solar cycle 23 was the 23rd solar cycle since 1755, when extensive recording of solar sunspot activity began. The solar cycle lasted 12.6 years, beginning in August 1996 and ending in December 2008. The maximum smoothed sunspot number observed during the solar cycle was 180.3 (November 2001), and the starting minimum was 11.2. During the minimum transit from solar cycle 23 to 24, there were a total of 817 days with no sunspots. Compared to the last several solar cycles, it was fairly average in terms of activity. History Large solar flares and coronal mass ejections (CMEs) occurred on 7 September 2005 (X17), 15 April 2001 (X14.4) and 29 October 2003 (X10), with auroras visible in mid-latitudes. 2000 One of the first major aurora displays of solar cycle 23 occurred on 6 April 2000, with bright red auroras visible as far south as Florida and South Europe. On 14 July 2000, the CME hurled by a X5.7 solar flare provoked an extreme (G5 level) geomagnetic storm the next day. Known ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Cycle 22
Solar cycle 22 was the 22nd solar cycle since 1755, when extensive recording of solar sunspot activity began. The solar cycle lasted 9.9 years, beginning in September 1986 and ending in August 1996. The maximum smoothed sunspot number observed during the solar cycle was 212.5 (November 1989), and the starting minimum was 13.5.SIDC Monthly Smoothed Sunspot Number. During the minimum transit from solar cycle 22 to 23, there were a total of 309 days with no sunspots.Spotless Days.What's Wrong with the Sun? (Nothing) more information: Spotless Days. ""Solaemon's Spotless Days Page. March 1989 geomagnetic storm During March 1989, a severe geomagnetic storm caused the collapse of Hydro-Québec's electricity transmission system. The geomagnetic storm causing this event was itself the result of a Coronal Mass Ejection on March 9, 1989. A few days before, on March 6, 1989, a very large X15 solar flare also occurred. At 2:44 am on March 13, 1989, a severe geomagnetic storm struck Earth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coronagraph
A coronagraph is a telescopic attachment designed to block out the direct light from a star or other bright object so that nearby objects – which otherwise would be hidden in the object's bright glare – can be resolved. Most coronagraphs are intended to view the corona of the Sun, but a new class of conceptually similar instruments (called ''stellar coronagraphs'' to distinguish them from ''solar coronagraphs'') are being used to find extrasolar planets and circumstellar disks around nearby stars as well as host galaxies in quasars and other similar objects with active galactic nuclei (AGN). Invention The coronagraph was introduced in 1931 by the French astronomer Bernard Lyot; since then, coronagraphs have been used at many solar observatories. Coronagraphs operating within Earth's atmosphere suffer from scattered light in the sky itself, due primarily to Rayleigh scattering of sunlight in the upper atmosphere. At view angles close to the Sun, the sky is much bri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
