Detection of large scale TIDs associated with the dayside cusp using SuperDARN data

Karpacheva, A T, Beloff, N, Carozzi, T D, Denisenko, P F, Karhunen, T J T and Lester, M (2010) Detection of large scale TIDs associated with the dayside cusp using SuperDARN data. Journal of Atmospheric and Solar-Terrestrial Physics, 72 (9-10). pp. 653-661. ISSN 1364-6826

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Variations in the dayside ionosphere parameters as a result of a large-scale acoustic gravity wave (LS AGW) were studied for the 17 February 1998 substorm using the super dual auroral radar network (SuperDARN) measurements. This event was characterised by a sharp rise in the AE index with a maximum of similar to 900 nT. The source of the disturbance responsible for the LS AGW appears to have been located within the plasma convection throat and in the dayside cusp region. The location of the source was obtained from studies of a number of datasets including high-latitude convection maps, data from 4 DMSP satellites and networks of ground-based magnetometers. The propagation of the IS AGWs caused quasi-periodic variations in the skip distance (with an amplitude up to 220-260 km) of the ground backscatter measured by up to 6 SuperDARN radars, including Goose Bay and Kapuskasing, resulting in two large-scale travelling ionospheric disturbances (LS TIDs). The IS TIDs had wave periods of 1.5 and 2 h, a velocity of similar to 400 m/s for both, and wavelengths of 2200 and 2900 km, respectively. These quasi-periodic variations were also present in the peak electron density and height of the F2 layer measured by the Goose Bay ionosonde. The numerical simulation of the inverse problem show good agreement between Goose Bay radar and Goose Bay ionosonde measurements. But these LS TIDs would be difficult to deduce from the ground based ionospheric station data alone, because h(m)F2 variations were 10-40 km only and f(o)F2 variations between 10% and 20%. The results demonstrate how important SuperDARN radars can be, and that this is a more powerful technique than routine ground-based sounding for studies of weak quasi-periodic variations in the dayside subauroral ionosphere related to LS AGW.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Informatics
Depositing User: Natalia Beloff
Date Deposited: 06 Feb 2012 20:48
Last Modified: 02 Jul 2019 22:34

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