Browsing by Author "Keith Whiter, Daniel"
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Horizontal electric fields from flow of auroral O+(2P) ions at sub-second temporal resolution
Tuttle, Sam; Lanchester, Betty; Gustavsson, Björn Johan; Keith Whiter, Daniel; Ivchenko, Nickolay; Fear, R. C.; Lester, Mark (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-14)Electric fields are a ubiquitous feature of the ionosphere and are intimately linked with aurora through particle precipitation and field-aligned currents. They exhibit order-of-magnitude changes on temporal and spatial scales of seconds and kilometres respectively which are not easy to measure; knowing their true magnitude and temporal variability is important for a theoretical understanding of ... -
A new auroral phenomenon, the anti-black aurora
Nel, A.E.; Kosch, M.J.; Keith Whiter, Daniel; Gustavsson, Björn Johan; Aslaksen, Torun Helene (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-19)Black auroras are small-scale features embedded in the diffuse background aurora, typically occurring post-substorm after magnetic midnight and with an eastward drift imposed. Black auroras show a significant reduction in optical brightness compared to the surrounding diffuse aurora, and can appear as slow-moving arcs or rapidly-moving patches and arc segments. We report, for the first time, an even ...