Synoptic distribution of dayside aurora: Multiple-wavelength all-sky observation at Yellow River Station in Ny-Ålesund, Svalbard

• Published in: Journal of Atmospheric and Solar-Terrestrial Physics
• Main Authors: Hu, Z.-J., Yang, H., Huang, D., Araki, T., Sato, N., Taguchi, M., Seran, Elena, Hu, H., Liu, R., Zhang, B., Han, D., Chen, Z., Zhang, Q., Liang, J., Liu, S.
• Other Authors: Polar Research Institute of China (PRIC), School of Electronic Information Wuhan, Wuhan University China, Data Analysis Center for Geomagnetism and Space Magnetism Kyoto, Kyoto University, National Institute of Polar Research Tokyo (NiPR), HELIOS - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Life Science Research Center, Xidian University, Xidian University
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2009
• Subjects: Particle precipitation; Dayside aurora; Auroral ionosphere; Ionosphere/magnetosphere interactions; [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; Ny-Ålesund; Svalbard; Ny Ålesund
• Online Access: https://hal.science/hal-00429171; https://doi.org/10.1016/j.jastp.2009.02.010

International audience Observations acquired from three-wavelength (427.8, 557.7 and 630.0 nm) all-sky imagers (ASIs) at Yellow River Station (YRS) in Ny-Ålesund, Svalbard, are used to examine the synoptic distribution of dayside aurora. The results demonstrate that the maximum emission regions (MERs) at each wavelength are all located in the postnoon sector, but have rather different magnetic local time (MLT) distributions from each other. The so-called 15 MLT “hot spot” is the overlapping region of the MERs at three wavelengths, and the prenoon “warm spot” is characterized uniquely by an increase of emissions at the 557.7 nm wavelength. The detailed dayside auroral spectra and morphology as a function of MLT are discussed.