Reconstruction of precipitating electrons and three-dimensional structure of a pulsating auroral patch from monochromatic auroral images obtained from multiple observation points
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https://hdl.handle.net/10037/27748Date
2022-07-12Type
Journal articleTidsskriftartikkel
Peer reviewed
Author
Fukizawa, Mizuki; Sakanoi, Takeshi; Tanaka, Yoshimasa; Ogawa, Yasunobu; Hosokawa, Keisuke; Gustavsson, Björn Johan; Kauristie, Kirsti; Kozlovsky, Alexander; Raita, Tero; Brändström, Urban; Sergienko, TimaAbstract
In recent years, aurora observation networks using
high-sensitivity cameras have been developed in the polar regions. These networks allow dimmer auroras, such as pulsating auroras (PsAs), to be observed with a high signal-to-noise
ratio. We reconstructed the horizontal distribution of precipitating electrons using computed tomography with monochromatic PsA images obtained from three observation points.
The three-dimensional distribution of the volume emission
rate (VER) of the PsA was also reconstructed. The characteristic energy of the reconstructed precipitating electron flux
ranged from 6 to 23 keV, and the peak altitude of the reconstructed VER ranged from 90 to 104 km. We evaluated the
results using a model aurora and compared the model’s electron density with the observed one. The electron density was
reconstructed correctly to some extent, even after a decrease
in PsA intensity. These results suggest that the horizontal distribution of precipitating electrons associated with PsAs can
be effectively reconstructed from ground-based optical observations.
Publisher
Copernicus PublicationsCitation
Fukizawa, Sakanoi, Tanaka, Ogawa, Hosokawa, Gustavsson, Kauristie, Kozlovsky, Raita, Brändström, Sergienko. Reconstruction of precipitating electrons and three-dimensional structure of a pulsating auroral patch from monochromatic auroral images obtained from multiple observation points. Annales Geophysicae. 2022;40(4):475-484Metadata
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