Dayside auroral emissions controlled by interplanetary magnetic field: a survey for dayside auroral excitation at 557.7 and 630.0 nm in Ny-Ålesund, Svalbard

Details Dayside auroral emissions controlled by interplanetary magnetic field: a survey for dayside auroral excitation at 557.7 and 630.0 nm in Ny-Ålesund, Svalbard Dayside auroral emissions controlled by interplanetary magnetic field: a survey for dayside auroral excitation at 557.7 and 630.0 nm in Ny-Ålesund, Svalbard

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11a1680h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM11A-1680

Physics

[2407] Ionosphere / Auroral Ionosphere, [2704] Magnetospheric Physics / Auroral Phenomena, [2724] Magnetospheric Physics / Magnetopause And Boundary Layers

Scientific paper

A survey of dayside auroral emission at 557.7 and 630.0 nm acquired from the all-sky imager at Chinese Yellow River station (YRS) in Ny-Ålesund, Svalbard, shows that the dayside auroral oval could divide into 5 auroral active regions (AARs) based on the spectral characteristics, i.e. the green aurora sectors on dawn (Da, 0600-0730 MLT) and dusk (Du, 1530-1700 MLT) oval, the prenoon (W, 0730-1000 MLT) and postnoon (H, 1300-1530 MLT) peaks for auroral emissions at 557.7 and 630.0 nm, the midday gap (M, 1000-1300 MLT) for green aurora. These MLT regions present different emission characteristics with the variety of interplanetary parameters:1) the auroral emissions at 630.0 nm in sector 0730-1000 and 1300-1530 MLT sectors present double-peak characteristic between IMF clock angle (CA) 0° and 360°: one is at 90° and another is at 270°; the auroral emission in midday oval (1000-1300 MLT) is dominantly excitated during 90-270°. Based on these characteristics, we suggest that the auroral emissions in sector 0730-1000 and 1300-1530 MLT is related with the prenoon and prenoon anti-parallel reconnection in high-latitude magnetopause, and the auroral emission in sector 1000-1300 MLT dominantly result from the subsolar component reconnection and low-latitude anti-parallel reconnection. 2) The 557.7-nm auroral intensity on postnoon oval, especially the 1530-1700 MLT sector, gradually increases with the enhancement of inter-hemispheric electric field (Ez=By×Vsw), when the IMF By is negative. It implies that IMF By-associated upward field-aligned currents produced by the inter-hemispheric electric field could control the postnoon auroral activities in the close field lines: The upward IMF By-associated FAC results in the increase of net upward FACs which overlap with the postnoon oval, the intensity of postnoon aurora is increasing at the same time. Acknowledgments: This work was supported by funds, which are listed as the follow: 41031064, 40904041, 40974103, 40874062, 40604020, 40890164 and 60872154, 2006BAB18B06, 2008AA121703, GYHY200706043, 09R21421800, SOA2010613. Intensity variety of auroral emissions at 557.7 and 630.0 nm in different AARs with the change of IMF clock angle and inter-hemispheric electric field

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