Plasma Line in the Ionosphere

Abstract:

New Plasma Line Observations from the Arecibo Radar show the exact timings of the Arecibo's conjugate sunrise as well as the local sunrise. Using the shadow height of the Earth's radius extend 175 km, we have predicted the time at which local sunrise effects propagate downward with time. These predictions agree within a minute of the observed effects. We can observe the apparent conjugate sunrise with equivalent sensitivity. We are currently comparing the data with predictions from various locations of Arecibo's conjugate point. We have compared our results with the standard tilted dipole configuration and seen a 25 minute discrepancy. Now we are investigating if the delay can be accounted for using research from Laura Waldrop's paper “Photoelectron impact excitation of OI 8446 A emission observed from Arecibo Observatory.