1980
DOI: 10.1029/ja085ia05p02185
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Ground‐based observations of F region aurora associated with the magnetospheric cusp

Abstract: A multinational program of optical observations of the dayside aurora was carried out at Longyearbyen and Ny Alesund, Svalbard, during the winter of 1978-1979. Observations were made of the temporal and spatial variations of the particle precipitation region characterized by a predominance of [O I] 6300-A emission previously mapped by satellites and associated with the magnetospheric cusp. This region expands and moves equatorward at a rate proportional to the negative excursion of the H component of the distu… Show more

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Cited by 72 publications
(17 citation statements)
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“…5a). In order to make statistical studies, we firstly make the dayside auroral keogram for every day in 84-day observations, then obtain the average auroral intensity keogram of each emission line in zenith angle-UT coordinates, and finally transform the averaged keogram into MLT-MLAT (magnetic latitude) coordinates using the method developed by Yang et al (1997a), and by assuming the maximum heights of auroral emissions are 120 km (427.8 nm), 150 km (557.7 nm) and 220 km (630.0 nm), respectively (Deehr et al, 1980;Sigernes et al, 1996;Sandholt et al, 2002a). At the same time, averaged emissions are corrected in order to take account the Van Rhijn effect (Yang et al, 1997b), which produces an attenuation of recorded emissions.…”
Section: Methodsmentioning
confidence: 99%
“…5a). In order to make statistical studies, we firstly make the dayside auroral keogram for every day in 84-day observations, then obtain the average auroral intensity keogram of each emission line in zenith angle-UT coordinates, and finally transform the averaged keogram into MLT-MLAT (magnetic latitude) coordinates using the method developed by Yang et al (1997a), and by assuming the maximum heights of auroral emissions are 120 km (427.8 nm), 150 km (557.7 nm) and 220 km (630.0 nm), respectively (Deehr et al, 1980;Sigernes et al, 1996;Sandholt et al, 2002a). At the same time, averaged emissions are corrected in order to take account the Van Rhijn effect (Yang et al, 1997b), which produces an attenuation of recorded emissions.…”
Section: Methodsmentioning
confidence: 99%
“…This magnetic latitude makes Longyearbyen a cusp station, and local magnetic noon occurs approximately at 0830 UT. The Longyearbyen station collects optical data from December through January of each season, and collects digital magnetic data year round, Deehr et al [1980]. The optical data used here were acquired with an MSP which has five photometers with differing wavelength filters; a tilting filter mechanism is used to perform background subtraction, Eather and Reasoner [1989] in that they are only red, with no green, and that these arcs happen during a cusp passage that has a distinct midday Olson and Sampson [1979] for details).…”
Section: Observationsmentioning
confidence: 99%
“…The problem of background contamination was solved with the introduction of the tilting filters, and the interest in altitude/luminosity profiles was replaced by studies of the relative morphologies of individual emissions, especially for the separation of hydrogen emission from electron-induced aurora (Deehr and Lummerzheim, 2001). Photon counting, combined with computer control was introduced by 1976 (Romick, 1976), so only one season of simultaneous msp measurements were made between FYU and PKR before the Fort Yukon msp was moved to Longyearbyen, Svalbard in the summer of 1978 (Deehr et al, 1980) Extensive observing efforts during the IGY culminated in a series of height measurements of discrete auroral arcs for six days near the end of March 1960. These arcs were chosen from strip chart data and the triangulation and plotting procedures were carried out by hand.…”
Section: Introductionmentioning
confidence: 99%