On the Growth Phase of Large-Scale Wave Structure and Plasma Bubbles

Details On the Growth Phase of Large-Scale Wave Structure and Plasma Bubbles On the Growth Phase of Large-Scale Wave Structure and Plasma Bubbles

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa11b..02t&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA11B-02

Physics

2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2435 Ionospheric Disturbances, 2439 Ionospheric Irregularities, 2471 Plasma Waves And Instabilities (2772)

Scientific paper

For those interested in understanding the day-to-day variability in the occurrence of equatorial plasma bubbles (EPBs), it is important to realize that (1) EPBs are spawned and launched from the crests of large-scale wave structure (LSWS) that develop in the bottomside of the equatorial F layer, and (2) LSWS appears to develop during the post-sunset rise (PSSR) of the F layer. The implication is strong that the process is not just a random seeding that occurs during the course of a night, as might be expected from atmospheric gravity waves. This behavior is consistent with observations that have shown that most EPBs are launched at the end of the PSSR, or soon thereafter. The focus should be, therefore, to determine how LSWS is excited and amplified during the PSSR, which includes E region sunset. The major obstacle, to date, has been the lack of diagnostic sensors that are capable of probing into the base of the F layer, where the plasma densities are low, and detecting (preferably describing) LSWS during its growth phase. Some progress toward this end has been made, however, through use of ALTAIR, a steerable incoherent-scatter radar, and newly found signatures of LSWS in ionograms. Results are also expected to be forthcoming from total electron content measurements that can be made using radio beacons on board the low-inclination-orbiting C/NOFS satellite. A brief review of this topic will be presented.

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