We compare observations of equatorial plasma bubbles (EPBs) by polar- orbiting satellites of the Defense Meteorological Satellite Program (DMSP) with plasma density measurements from the Republic of China Satellite (ROCSAT-1) in a low-inclination orbit. DMSP data were acquired in the evening sector at low magnetic latitudes between 1989 and 2002. ROCSAT-1 plasma densities were measured in March and April of 2000 and 2002. Observations of individual EPBs detected by both ...
This study compared seasonal and longitudinal distributions of more than 8300 equatorial plasma bubbles (EPBs) observed during a full solar cycle from 1989 to 2000 with predictions of two simple models. Both models are based on considerations of parameters that influence the linear growth rate of the generalized Rayleigh-Taylor instability in the context of finite windows of opportunity available during the prereversal enhancement near sunset. These parameters are the strength ...
This paper compares evening sector measurements by the Jicamarca unattended long-term studies of the ionosphere and atmosphere (JULIA) radar, the Ancon scintillation monitor, and plasma density sensors on Defense Meteorological Satellite Program (DMSP) satellites. During more than half of the 110 nights of JULIA operations in 1998 and 1999, backscatter was observed from plumes extending above the layer of bottomside spread F. On 98% of the nights with no plumes, ...
We have reexamined the relationship between U-shaped peak-flux- density microwave spectra and solar proton events for approx 200 large (Sp(> or = 2GHz) > or = 800 solar flux uits (sfu) microwave burst (1965 - 1979). The radio spectra fell into two basic classes: (a) U-shaped with two maxima ( > or = 800 sfu) in the range from 200 MHz to > or = 10 GHz (59 percent of ...
From this study of the peak flux density spectra of nearly 200 large (sp > or = 2 GHz) > or = 800 solar flux units) microwave bursts and their associated proton and sweep frequency emissions, we have found the following: (1) There appear to be two basic peak-flux-density spectral types: (a) U-shaped, with two maxima > or = 800 sfu in the range of 200 MHz to > or ...
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