Conveners
W1-2 DASP General Contributions II (DASP) | DPAE: contributions générales II (DPAE)
- Johnathan Burchill (University of Calgary)
Data recorded simultaneously by different instruments on the payload of the Enhanced Polar Outflow Probe (e-POP) provide evidence about the relationships of ionospheric processes. Launched in September 2013 on the Canadian small satellite CASSIOPE into low-earth orbit, the e-POP ensemble has been able to exploit novel ionospheric perspectives. The understanding of auroral-latitude physics is...
The Swarm satellite mission is well into its four-year mission to provide precise, multi-point in situ observations of magnetic and electric fields, along with plasma properties of the ionosphere. When combined with ground-based cameras, Swarm provides an excellent opportunity to study the electrodynamic properties of auroral forms such as arcs and pulsating patches. This talk will...
We investigate whether the boundaries of a region of plasma in the ionosphere of different density than its surroundings will drift relative to the background ambipolar drift and, if so, how the drift depends on the degree of density enhancement, or on the altitude. There are analytical solutions for discrete circular features both with and without neutral collisions. We find that the drift...
The study of geomagnetism has been documented as far back as 1722 (Graham) with increased interest at the end of the 19th century (Lamb, Schuster, Chapman, and Price). The Magnetotelluric Method was first introduced in the 1950's (Cagniard and Tikhonov), and, at its core, is simply a regression problem. The result of this method is a transfer function estimate which describes the earth's...
Solar modes are normal modes whose origin lies in the solar interior or the solar surface. Recent findings in the fields of geophysics and space weather have demonstrated that the power spectra of time-series outputs in ground-based detection systems exhibit structure which is characteristic of solar modes. In a physical model which describes the induction of solar-mode disturbances at...
It is now well-known that under the action of a strong electric field, ions in the high latitude F region acquire a toroidal (doughnut shape) velocity distribution as a result of collisions with neutral particles. As defined by the second moment of the velocity distribution, the resulting velocity distributions have different temperatures along and perpendicular to the magnetic field. An...
The three Swarm satellites were launched from Plesetsk, Russia in November 2013, with the mission to measure the goemagnetic field with unprecedented accuracy. These measurements in turn will help us better understand of the many contributions to the near-Earth magnetic field, from the Earth core, up to the ionosphere and magnetosphere. Each of the three satellites is equipped with a vector...
Nearly two decades of auroral zone magnetometer observations are used to develop statistical predictions of geomagnetic field time derivatives.
Distributions of differences between successive 5-second vector field measurements are approximately lognormal, motivating a parametrization in terms of the first and second log-moments which are nearly uncorrelated and exhibit very different...
