@article{ionosphere_motion,
	title={Tongue of Ionization Motion Estimation From Polar TEC Sequences},
	author={Foster, M. P. and Evans, A. N.},
	journal={Geoscience and Remote Sensing Letters, IEEE},
	year={2009},
	month={July},
	volume={6},
	number={3},
	pages={582-586},
	doi={10.1109/LGRS.2009.2019970},
	ISSN={1545-598X}, 
}