Dayside ionospheric response to changes in IMF polarity: optical and plasma-¯ow observations
Abstract. The response of the dayside ionosphere to changes in polarity of the interplanetary magnetic ®eld 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-A Ê lesund on Svalbard, and also in the...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.8941 http://hal.archives-ouvertes.fr/docs/00/31/67/00/PDF/angeo-18-782-2000.pdf |
| Summary: | Abstract. The response of the dayside ionosphere to changes in polarity of the interplanetary magnetic ®eld 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-A Ê lesund on Svalbard, and also in the line-of-sight plasma velocities monitored by the Finland CUTLASS Super-DARN radar. A time di€erence of some 6 to 8 min occurred between the responses of the two techniques, with the ¯ows being ®rst 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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