Optical observations of the growth and day-to-day variability of equatorial plasma bubbles

Details Optical observations of the growth and day-to-day variability of equatorial plasma bubbles Optical observations of the growth and day-to-day variability of equatorial plasma bubbles

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11303307m&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A3, CiteID A03307

Other

10

Ionosphere: Ionospheric Irregularities, Ionosphere: Equatorial Ionosphere, Ionosphere: Instruments And Techniques, Space Weather: General Or Miscellaneous

Scientific paper

A new narrow-field ionospheric imaging system, the Portable Ionospheric Camera and Small-Scale Observatory, has been installed at the Cerro Tololo Inter-American Observatory near La Serena, Chile (geographic 30.17°S, 289.19°E geomagnetic 16.72°S, 0.42°E). We present observations of the naturally occurring nightglow emission at 630.0 nm on three consecutive nights demonstrating the day-to-day variability in the occurrence of equatorial plasma bubbles or depletions. On two nights, large-scale undulations with a wavelength on the order of 300-600 km are observed in the emission regions magnetically connected to the bottomside of the equatorial F layer. We demonstrate that at each crest of these large-scale waves, zero, one, or multiple depletions may grow. Thus, the presence of a large-scale wave on the bottomside alone is not sufficient for irregularity growth. This variability is presumably due to the presence, or lack, of small-scale seed waves or some other mechanism needed to increase the instability growth rate past the critical threshold.

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