Articles | Volume 40, issue 5
Ann. Geophys., 40, 605–618, 2022
Ann. Geophys., 40, 605–618, 2022
Regular paper
12 Oct 2022
Regular paper | 12 Oct 2022

Magnetic local time (MLT) dependence of auroral peak emission height and morphology

Noora Partamies et al.

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Cited articles

Aikio, A.T., Vanhamäki, H., Workayehu, A.B., Virtanen, I.I., Kauristie, K., Juusola, L., Buchert, A., and Knudsen, D.: Swarm satellite and EISCAT radar observations of a plasma flow channel in the auroral oval near magnetic midnight, J. Geophys. Res., 123, 5140–5158,, 2018. a
Akasofu, S.-I.: Recent progress in studies of DMSP auroral photographs, Space Sci. Rev., 19, 169–215, 1976. a, b
Bland, E. C., Partamies, N., Heino, E., Yukimatu, A. S., and Miyaoka, H.: Energetic electron precipitation occurrence rates determined using the Syowa East SuperDARN Radar, J. Geophys. Res., 124, 6253–6265,, 2019. a
Davis, T. N. and Sugiura, M.: Auroral electrojet activity index AE and its universal time variations, J. Geophys. Res., 71, 785–801,, 1966. a
Frey, H.U., Han, D., Kataoka, R., Lessard, M. R., Milan, S. E., Nishimura, Y., Strangeway, R. J., and Zou, Y.: Dayside Aurora, Space Sci. Rev., 215, 51,, 2019. a, b
Short summary
We investigate the local time behaviour of auroral structures and emission height. Data are collected from the Fennoscandian Lapland and Svalbard latitutes from 7 identical auroral all-sky cameras over about 1 solar cycle. The typical peak emission height of the green aurora varies from 110 km on the nightside to about 118 km in the morning over Lapland but stays systematically higher over Svalbard. During fast solar wind, nightside emission heights are 5 km lower than during slow solar wind.