[1] High-frequency cross-modulation is employed to probe the D region ionosphere during HF heating experiments at the High-frequency Active Auroral Research Program (HAARP) observatory. We have adapted Fejer’s well-known cross-modulation probing method to determine the extent of ionospheric conductivity modification in the D region ionosphere with high (5 sec) time resolution. We demonstrate th...

We present an interval whereby we can estimate the energy dissipation in the ionosphere through an externally-driven field line resonance. In this paper, we utilise an interval described in general by Rae et al. (2005), where the global magnetospheric cavity was shown to be energised via a high solar wind speed stream. Using the ground-based instrumentation available, we estimate the spatial ex...

BEIDOU AND GPS DUAL CONSTELLATION VECTOR TRACKING DURING IONOSPHERE SCINTILLATION AT EQUATORIAL REGION

• A two-dimensional, time-dependent, shock capturing single-sp•ies (O +)hydrodynamic odel of the Venus ionosphere, which solves the coupled continuity, momentum and energy _,•ons for the altitude range of 150 500 km and the solar zenith angle range of 0O 180 ø has been developed and is presented in this paper. It was again demonstrated thathe introduction of topside heat inflows leads to calcul...

Disturbances Caused by Tsunamis Yu-Ming Yang, James L. Garrison, See-Chen Lee Purdue University 1 Problem Statement Acoustic-Gravity Waves (AGWs) in the neutral atmosphere can induce disturbances in the ionosphere that are subsequently observable in trans-ionospheric Global Navigation Satellite System (GNSS) measurements of Total Electron Content (TEC). Disruptive events on the Earth’s surface,...

The Di erential Global Positioning System-based precision approach and landing architectures proposed by the Federal Aviation Administration (FAA) include the Wide Area Augmentation System (WAAS) and the Local Area Augmentation System (LAAS) for performing landings in Category (CAT) I and CAT III minima, respectively. The Required Navigation Performance (RNP) for GPS-based satellite navigation ...

We present a study of scintillation induced by the mid-latitude ionosphere. By implementing methods currently used in Interplanetary Scintillation studies to measure amplitude at low frequencies, we have proven it is possible use Murchison Widefield Array ionospheric weak regime, which sensitive structures on scales $\sim$300 m our observing frequency 154 MHz, where phase variance this scale wa...

Alfvtn waves with frequencies of the order of several Hertz have been observed in the auroral region. These waves are thought to be responsible for the acceleration f !0nosphen'c particles out of the ionosphere and into the magnetosphere. As an Alfvtn wave propagates into an inhomogeneous ionosphere, the amplitude of the wave decreases resulting in a gradient in the electric field and a pondero...