ROCSAT Observations of Meso-Scale Density and Flow Undulations in Conjuction with Intermediate-Scale Density Irregularities at Midlatitude Topside Ionosphere

Details ROCSAT Observations of Meso-Scale Density and Flow Undulations in Conjuction with Intermediate-Scale Density Irregularities at Midlatitude Topside Ionosphere ROCSAT Observations of Meso-Scale Density and Flow Undulations in Conjuction with Intermediate-Scale Density Irregularities at Midlatitude Topside Ionosphere

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa21a0279s&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA21A-0279

Physics

2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere, 2481 Topside Ionosphere

Scientific paper

ROCSAT-1 orbiting at 600 km topside ionosphere frequently observes the meso-scale (~50 to 1000 km) ion density and flow undulations at low- to mid-latitudes. During the 8 January 2000 event, noticeable intermediate-scale (1 to 50 km) density irregularities were also observed at midlatitude in conjunction with the meso-scale undulations in many consecutive ROCSAT orbits. The meso-scale density and flow undulations indicate in-phase variations among the radial outward flow, westward flow, and the density enhancement. During these consecutive ROCSAT orbits of observing the meso-scale undulations, the calculated electric field perturbations all point to the northeast-southwest direction at about ° in azimuth. This implies that a frontal structure of the meso-scale disturbance is aligned from northwest to southeast in geographic coordinate. The in-phase undulations of the flow and density variations together with the tilted frontal structure for the meso-scale disturbance fit the predicting result of the Perkins instability [Perkins, 1973]. It could also be caused by the disturbances mapped from plasma cloud instabilities in E region in the model of Hysell et al. [2002] or from the instabilities in the sporadic E layers proposed by Haldoupis et al. [2003] and Tsunoda et al. [2004]. As for the intermediate-scale density irregularities, no correlated phase relationship is found between the density fluctuations and the flow variations. From the fact that the occurrences of the intermediate-scale irregularities are isolated from the meso-scale undulations, we conclude that the cause of the intermediate-scale irregularities should be different from what triggered the meso-scale undulations. The possible interaction between the two triggering mechanisms for the irregularities of the two different scales will be discussed.

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