Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa11a1499k&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA11A-1499
Physics
2411 Electric Fields (2712), 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics
Scientific paper
The pre-reversal enhancement (PRE) is known to be the most important single parameter in the generation of equatorial plasma bubbles (EPBs). Observations in the Peruvian sector have shown that a threshold PRE velocity is required to generate EPBs. This connection was established through the correlation of observations of the PRE velocity and occurrence of spread F: the question is whether this cause-and-effect relationship holds on a global basis. The problem in establishing a causal link between a PRE velocity threshold and the occurrence of EPBs from satellite data is that the satellite with high inclination is not able to provide the PRE and EPB data at the same location in the consecutive orbits unlike a ground site in the equatorial region that can measure the PRE and then observe whether or not EPBs form at a later time. A low-inclination orbit, such as that of C/NOFS, enables one to observe the magnitude of the PRE on one pass and then detect EPBs on the next pass at or near the same location. We will analyze the observations of vertical ion velocity and ion density from ROCSAT and CNOFS/CINDI. The PRE characteristics (peak velocity and its occurrence local time) will be determined for each orbit and the occurrence of EPBs in association of the PRE characteristics will be investigated by monitoring the occurrence of EPBs in the following orbits. This study is the first attempt to demonstrate the capability to establish the one-to-one relationship between PRE and EPB using data from a single satellite.
Heelis Roderick A.
Kil Hyosub
Paxton Larry J.
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