Auroral boundary correlations between UVI and DMSP

Carbary, J. F.; Sotirelis, T.; Newell, P. T.; Meng, C.‐I.

doi:10.1029/2002ja009378

Cited by 50 publications

(134 citation statements)

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“…The SWB proxy above 748 latitude in the 1200-1900 MLT sector is shown in green (from Chisham et al 2005c) Hosokawa et al 2004;Wright et al 2004; but see also . Chisham et al (2005a) noted that the MLT variation of the latitudinal offset between the SWB and the OCB was identical to that observed between the poleward edge of the Lyman-Birge-Hopfield ''Long'' (LBHL) auroral oval (*170 nm) measured by the UVI instrument on the Polar spacecraft and the OCB, as determined by Carbary et al (2003). This is illustrated in Fig.…”

Section: Determining the Ocbmentioning

confidence: 58%

“…This is illustrated in Fig. 12 where the red symbols represent the mean latitudinal offsets determined by Carbary et al (2003) in each 1-h MLT sector. The red radial error bars show the standard deviation of the latitude difference distributions in each MLT sector.…”

Section: Determining the Ocbmentioning

confidence: 99%

“…For the other proxies the mean latitude difference in each 1-h MLT bin is shown by a coloured square and the standard deviations by the radial error bars. The Polar UVI proxy is shown in red and a red dashed line shows a low-order harmonic expansion fit to the mean latitude differences (from Carbary et al 2003). The SWB proxy is shown in blue in the 1900-2400 MLT sector (from Chisham et al 2004) and the 0000-1200 MLT sector (from Chisham et al 2005a).…”

Section: Determining the Ocbmentioning

confidence: 99%

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A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions

et al. 2007

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The Super Dual Auroral Radar Network (SuperDARN) has been operating as an international co-operative organization for over 10 years. The network has now grown so that the fields of view of its 18 radars cover the majority of the northern and southern hemisphere polar ionospheres. SuperDARN has been successful in addressing a wide range of scientific questions concerning processes in the magnetosphere, ionosphere,

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Section: Determining the Ocbmentioning

confidence: 58%

Section: Determining the Ocbmentioning

confidence: 99%

Section: Determining the Ocbmentioning

confidence: 99%

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A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions

et al. 2007

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“…5a. The red symbols and error bars represent the spatial variation of the OCB-UVI latitude differences measured by Carbary et al (2003). The red dashed line represents the low-order harmonic expansion fit applied to their results by Carbary et al (2003).…”

Section: Discussionmentioning

confidence: 99%

“…Studies to date have included comparisons with boundaries measured by ground-based imagers (Blanchard et al, 1995(Blanchard et al, , 1997 and UltraViolet Imagers (UVI) on spacecraft (Kauristie et al, 1999;Baker et al, 2000). The most comprehensive investigation of this type is that of Carbary et al (2003). They compared ∼23 000 DMSP observations of the OCB with the poleward boundary of UVI auroral emissions measured by the Polar spacecraft.…”

Section: Introductionmentioning

confidence: 99%

A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the morning sector ionosphere

et al. 2005

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Abstract. Determining reliable proxies for the ionospheric signature of the open-closed field line boundary (OCB) is crucial for making accurate ionospheric measurements of many magnetospheric processes (e.g. magnetic reconnection). This study compares the latitudes of Spectral Width Boundaries (SWBs), identified in the morning sector ionosphere using the Super Dual Auroral Radar Network (SuperDARN), with Particle Precipitation Boundaries (PPBs) determined using the low-altitude Defense Meteorological Satellite Program (DMSP) spacecraft, in order to determine whether the SWB represents a good proxy for the ionospheric projection of the OCB. The latitudes of SWBs and PPBs were identified using automated algorithms applied to 5 years (1997)(1998)(1999)(2000)(2001) of data measured in the 00:00-12:00 Magnetic Local Time (MLT) range. A latitudinal difference was measured between each PPB and the nearest SWB within a ±10 min Universal Time (UT) window and within a ±1 h MLT window. The results show that the SWB represents a good proxy for the OCB close to midnight (∼00:00-02:00 MLT) and noon (∼08:00-12:00 MLT), but is located some distance (∼2 • -4 • ) equatorward of the OCB across much of the morning sector ionosphere (∼02:00-08:00 MLT). On the basis of this and other studies we deduce that the SWB is correlated with the poleward boundary of auroral emissions in the Lyman-Birge-Hopfield "Long" (LBHL) UV emission range and hence, that spectral width is inversely correlated with the energy flux of precipitating electrons. We further conclude that the combination of two factors may explain the spatial distribution of spectral width values in the polar ionospheres. The small-scale structure of the convection electric field leads to an enhancement in spectral width in regions close to the OCB, whereas increases in ionospheric conductivity (relating to the level of incident electron energy flux) lead to a reduction in spectral width in regions just equatorward of the OCB.

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Statistical relationships between enhanced polar cap flows and PBIs

et al. 2014

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[1] Poleward boundary intensifications (PBIs) are auroral intensifications along the poleward boundary of the auroral oval and occur during all levels of geomagnetic activity. However, little is known about the triggering of PBIs. Recent case studies have indicated the existence of longitudinally localized flow channels in the polar cap near, and directed toward, the nightside open-closed field line boundary just before PBIs. Motivated by these studies, we analyze 115 events of coordinated observations by the Time History of Events and Macroscale Interactions during Substorms all-sky imager and Super Dual Auroral Radar Network HF radar at Rankin Inlet to determine if this polar cap flow-PBI relationship is commonly observed. We start with isolated and intense PBIs and examine the probability of them being associated with equatorward directed polar cap flows. Our results show the association to be frequent (90%), with one-to-one correlations occurring in~50% of events. Considering the limitations of the radar observations, this result indicates that PBIs are commonly correlated with polar cap flow channels directed toward, and then traversing, the open-closed field line boundary. The flows statistically occur~1-2 min before the PBI initiations, and the duration and width of the flows are comparable to those of the PBIs. We also perform a reverse study by starting with isolated polar cap flows and obtain similar results. The remarkably high occurrence of association between enhanced polar cap flows and PBIs indicates that enhanced mesoscale flows within the open field line region that traverse the open-closed field line boundary are an important driver of PBI formation.

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Auroral boundary correlations between UVI and DMSP

Cited by 50 publications

References 21 publications

A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions

A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions

A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the morning sector ionosphere

Statistical relationships between enhanced polar cap flows and PBIs

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