Within auroral ovals, some 100 to 1,000 km (62 to 620 mi) over our heads, high-energy electrons from solar plasma collide with air molecules in Earth's upper atmosphere. Finally, the Mid-latitude and Low-latitude regions are defined in terms of ranges in MLAT according to: Mid-lat from MLAT = 30 degrees up to the equatorward edge of auroral oval, and Low-lat by MLAT = -30 degrees to 30 degrees. Boundary definition: The auroral boundaries in the GUVI and SSUSI data products are defined as the location where the electron energy flux at a fixed level: 0.2 ergs/s/cm2. Auroras—Heavenly Lights. The zones lie about 10deg. The Atlantic Monthly, Volume 04, No. A7, PAGES 12,075-12,092, JULY 1, 1995 The double oval UV auroral distribution 1. Auroral Oval Boundaries. Determining Auroral Oval Boundaries Based on Global FUV Images and Aurora Model Yongliang Zhang 1, Larry J. Paxton , and Dieter Bilitza2 1Johns Hopkins University Applied Physics Laboratory 2NASA & George Mason University December 2, 2012, CEDAR-GEM Mini Workshop . The auroral zone is located 23° from the pole. Find 175 ways to say AURORAL, along with antonyms, related words, and example sentences at Thesaurus.com, the world's most trusted free thesaurus. The instantaneous distribution of auroras ("auroral oval" [1] [2]) is slightly different, centered about 3–5 degrees nightward of the magnetic pole, so that auroral arcs reach furthest toward the equator about an hour before midnight. When arranged in central meridian longitude ranges, the images show a significant contraction of the northern main oval as the central meridian longitude increases from 115 to 255 . The total maximum auroral current intensity is supposed to be represented by a strictly positive AE index, defined as AE = AU-AL (Davis and Sugiura, 1966). Observations in the last decade, such as those of Ia. Definitions Related words. However, defining this somewhat arbitrary boundary is at times difficult optically because of unusual auroral arc orientations with respect to the midnight aurora] oval. After the substorm onset the auroral oval becomes clearly bifurcated, consisting of two components: the oval aurora in the latitude range of the preonset oval, and the bulge aurora that emerges out of the oval. I. Fel’dshtein and O. V. Khorosheva from 1960 to 1963, have shown that the glow usually appears along an auroral oval, whose center is displaced 3° from the pole along the midnight meridian. ... AU/AL index being upper/lower envelop of H component disturbances observed in the auroral region, is positive/negative by definition. Auroral Oval An elliptical band around each geomagnetic pole ranging from about 75 degrees magnetic latitude at local noon to about 67degrees magnetic latitude at midnight under average conditions. Assuming the poleward boundary of the auroral oval to roughly overlap with the boundary between open and closed field lines the northern auroral oval is expected to broaden at the duskside (dawnside) of the oval for positive (negative) IMF B y. Polar arcs are expected to lie on the poleward boundary of the expanded side of the oval. Westward electrojet over entire auroral oval in extreme substorm cases. The auroral … Auroral Electrojet Peaks and Boundaries products in Section 4.2 as well as small refining of Flag Description text. When this rather rare condition obtains, the distinction between the two types of aurora is no longer as clear as depicted on the basis of statistical definitions of the auroral oval. Sky Show. Click on image to enlarge. Click for citation. 5 july 2019 . Jump to: General, Art, Business, Computing, Medicine, Miscellaneous, Religion, Science, Slang, Sports, Tech, Phrases We found 4 dictionaries with English definitions that include the word auroral oval: Click on the first link on a line below to go directly to a page where "auroral oval" is defined. Jump to: General, Art, Business, Computing, Medicine, Miscellaneous, Religion, Science, Slang, Sports, Tech, Phrases We found 23 dictionaries with English definitions that include the word auroral: Click on the first link on a line below to go directly to a page where "auroral" is defined. The largest difference between the location of the auroral oval and the 67 " curve occurs in the morning hours and it has been argued that the auroral orientation curve gives a better definition of the true auroral oval in this time interval. You can also add a definition of auroral zone yourself . The brightest aurora is found at midnight. auroral: Of or pertaining to the dawn. Credit: NSSDC, Holzworth and Meng. product in Section 4.3 1 dH . Standing on the Earth and looking north, the oval will be visible further south than it appears on the overhead image. The bulge aurora expands poleward out of the presubstorm oval, westward as well as eastward, from the premidnight onset location. 26, December, 1859 The model also tells us the strength of the predicted Aurora and it is important to point out that it represents the Auroral Oval as seen from directly overhead. 1 dI . Roughly circular bands around either geomagnetic pole above which there is a maximum of auroral activity. The Antarctic region and the Arctic region represent an area for such investigations. Definitions Related words. Those locations experience the maximum occurrence of aurorae. We perceive what are termed auroral plates of a purple or reddish-violet color, more or less extended, according as this species of veil, formed by icy particles, extends to a greater or less distance from the poles.. As solar particles hit Earth and enter the magnetosphere, they create an invisible, circulating flow of charged particles, called the auroral current, around the polar regions of the Earth. The auroras appear in oval regions near the North and South Poles owing to the influence of Earth’s dipole magnetic field. Source: science.nasa.gov: 2: 0 0. auroral zone. 100, NO. This model gives a short-term forecast of the intensity of the auroral oval for both the northern and the southern hemisphere. There are two steps in obtaining the global boundaries. It is found that diffuse, weak emission can fill in the region between the auroral oval and discrete auroral features in the polar cap. OVATION Auroral Forecast. 7 aug 2019 . Learn more. Examples of such features … The 1st step is to get the swath boundary by finding the auroral pixels at the fix flux level in a measured auroral image or Q map. SELECTION CRITERIA The distinction between polar cap and oval auroras may seem obvious because of the general definition that any feature poleward of the in- stantaneous oval is in the polar cap. Implications for the mapping of auroral arcs The portion of the Earth that traverses the midnight portion of an oval is known as the auroral zone. Aviation Glossary :: Auroral Oval: Welcome to the Dauntless Aviation Glossary! Read a National Geographic magazine article about auroras and get information, facts, and more about magnetic storms. At Dauntless, our editorial staff maintains the web's largest unified glossary of aviation terms. The U.S. Department of Energy's Office of Scientific and Technical Information auroral translation in French - English Reverso dictionary, see also 'aurore',aura',auréolé',aurai', examples, definition, conjugation A pseudo-breakup observation: Localized current wedge across the postmidnight auroral oval N. Partamies Geophysical Research, Finnish Meteorological Institute, Helsinki, Finland Image to right:A model of the auroral oval as seen from space overlaid on top of a visible image of Earth. Figure 2. the auroral orientation curve gives a better definition of the true auroral oval in this time interval. definition of new ‘‘reference ovals.’’ The overall auroral morphology pattern is shown to be fixed in System-III longitude and unchanged over a 5-year period. According to the most common definition, the 'polar cap' is the region bounded by the average or statistical auroral oval. ~ An oval-shaped distribution of the aurora. 1: 0 0. auroral zone. auroral meaning: 1. related to the light in the sky of an aurora (= a natural appearance of coloured light in the…. to 15 deg. Latitude: POLEQD and Longitude POLEQDmoved from Output Data to Notes as CDF global attributes for LPS product in Section 4.1 Note about Flag values specified in binary added to . Meso-scale auroral forms, such as poleward boundary intensifications, streamers, omega bands, beads and giant undulations, are manifestations of dynamic processes in the magnetosphere driven, to a large part, by plasma instabilities in the magnetotail. The false-color reds indicate the brightest aurora and blue the dimmest. This glossary is built from a combination of official, quasi-official, and proprietary sources (including original material that we develop oursselves). JOURNAL OF GEOPHYSICAL RESEARCH, VOL. The auroral oval is actually a natural coordinate system to which theoretically and practically the events of space geophysics in the ionosphere and magnetosphere are attached. It is based on the solar wind and interplanetary magnetic field (IMF) conditions as measured by the DSCOVR spacecraft. Auroral emissions typically occur at altitudes of about 100 km (60 miles) and are often green, white, or reddish in colour depending on what species (atomic oxygen, molecular oxygen, or nitrogen, respectively) is primarily emitting light. A new study of Saturn's auroral emissions has uncovered a secondary auroral oval, a quarter as bright as the main one. The Auroral Oval boundaries AOHI and AOLOW are described by: where C=22.5 degrees if MLT 22:50 and 337.5 degrees if MLT>22:50; S=+/-1 (nightside/dayside). 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