Dayside ionospheric response to changes in IMF polarity: optical and plasma-flow observations

International audience The response of the dayside ionosphere to changes in polarity of the interplanetary magnetic field was observed by two independent techniques. The signatures were seen in the 630.0 nm red-line emission, measured by a meridian scanning photometer at Ny-Ålesund on Svalbard, and...

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Bibliographic Details
Main Authors: Pryse, S. E., Smith, A. M., Kersley, L.
Other Authors: Department of Physics, University of Wales
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2000
Subjects:
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Ny-Ålesund
Svalbard
Ny Ålesund
Online Access:https://hal.science/hal-00316700
https://hal.science/hal-00316700/document
https://hal.science/hal-00316700/file/angeo-18-782-2000.pdf
Description
Summary:International audience The response of the dayside ionosphere to changes in polarity of the interplanetary magnetic field was observed by two independent techniques. The signatures were seen in the 630.0 nm red-line emission, measured by a meridian scanning photometer at Ny-Ålesund on Svalbard, and also in the line-of-sight plasma velocities monitored by the Finland CUTLASS SuperDARN radar. A time difference of some 6 to 8 min occurred between the responses of the two techniques, with the flows being first to respond. In the present case study, the longer delay in the optics suggests that ion precipitation controls the auroral emission.

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