Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa22a..05t&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA22A-05
Physics
2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere, 2471 Plasma Waves And Instabilities (2772)
Scientific paper
There is a tendency to refer to plasma structures as "midlatitude," when found well poleward of the equatorial ionization anomaly (EIA), but equatorward of the subauroral region, and to attribute them to the Perkins instability. Similarly, there is a tendency to refer to plasma structures as "equatorial," when found equatorward of the EIA crest, and to attribute them to the Rayleigh-Taylor instability. There is evidence, however, that geomagnetic field lines, which thread equatorial plasma bubbles at very high altitudes, can pass through the peak of the F layer at magnetic dip latitudes poleward of the EIA. In these events, interpretation is in terms of equatorial structure penetrating into the midlatitude ionosphere. More recently, there has appeared evidence that midlatitude structures may be able to penetrate into the equatorial ionosphere, that is, to dip latitudes equatorward of the EIA crest. We present examples of the latter and discuss which of the processes may be acting to account for these observations.
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