Polar cap patch segmentation of the tongue of ionization in the morning convection cell
Zhang, Q.-H., Zhang, B.-C., Moen, J., Lockwood, M., McCrea, I. W., Yang, H.-G., Hu, H.-Q., Liu, R.-Y., Zhang, S.-R. and Lester, M. (2013) Polar cap patch segmentation of the tongue of ionization in the morning convection cell. Geophysical Research Letters, 40 (12). pp. 2918-2922. ISSN 0094-8276
To link to this article DOI: 10.1002/grl.50616
Two types of poleward moving plasma concentration enhancements (PMPCEs) were observed during a sequence of pulsed reconnection events, both in the morning convection cell: Type L (low density) was associated with a cusp flow channel and seems likely to have been produced by ionization associated with particle precipitation, while Type H (high density) appeared to originate from the segmentation of the tongue of ionization by the processes which produced the Type L events. As a result, the Type L and Type H PMPCEs were interspersed, producing a complex density structure which underlines the importance of cusp flow channels as a mechanism for segmenting and structuring electron density in the cusp and shows the necessity of differentiating between at least two classes of electron density patches.