Radio Aurora Explorer: Mission science and radar system

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/95507/1/rds5936.pd

Radar and rocket comparison of UHF radar scattering from auroral electrojet irregularities: Implications for a nanosatellite radar

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/95174/1/jgra19910.pd

Space-Time Projection Optical Tomography: Search Space and Orbit Determination

In a companion article, we discussed the radiometric sensitivity and resolution of a new passive optical sensing technique, Space-Time Projection Optical Tomography (SPOT), to detect and track sub-cm and larger space debris for Space Situational Awareness. SPOT is based on the principle that long synthetic exposure can be achieved if the phase-space trajectory of a hypothetical point-source is precisely predictable within a very wide telescope field-of-view, which is the case for orbiting debris. This article discusses the computational search space for debris mining as well as a recursive measure-and-fit algorithm based on a generalized Hough transform for orbit determination.Comment: Space Situational Awarenes

Investigating Coherence among Turkish Elementary Science Teachers’ Teaching Belief Systems, Pedagogical Content Knowledge and Practice

This study investigated comprehensive science teaching belief systems and their relation to science teachers’ pedagogical content knowledge and teaching practices. Rokeach’s (1968) belief system was used as a framework for representing the hierarchy among in-service teachers’ teaching beliefs. This study employed a multiple case study design with three in-service science teachers. Cases were selected based on participant’s personal epistemology. Data were collected through interviews and classroom observations. Content analyses showed that when science teachers presented characteristics of autonomous self-construal more than related self-construal, they had a more advanced personal epistemology. In addition, these beliefs shaped participants’ conceptions of teaching and learning science as well as self-efficacy beliefs, knowledge and practice. Given these results, it is important for social psychologists to collaborate with science teachers to support their self-construa

Magnetic Sensor Calibration and Residual Dipole Characterization for Application to Nanosatellites

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/83632/1/AIAA-2010-7518-617.pd

First measurements of radar coherent scatter by the Radio Aurora Explorer CubeSat

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/95350/1/grl29342.pd

Radio Aurora Explorer: A Mission Overview

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/140647/1/1.a32436.pd

Magnetosphere-Ionosphere Coupling Through E-region Turbulence: Anomalous Conductivities and Frictional Heating

Global magnetospheric MHD codes using ionospheric conductances based on laminar models systematically overestimate the cross-polar cap potential during storm time by up to a factor of two. At these times, strong DC electric fields penetrate to the E region and drive plasma instabilities that create turbulence. This plasma density turbulence induces non-linear currents, while associated electrostatic field fluctuations result in strong anomalous electron heating. These two effects will increase the global ionospheric conductance. Based on the theory of non-linear currents developed in the companion paper, this paper derives the correction factors describing turbulent conductivities and calculates turbulent frictional heating rates. Estimates show that during strong geomagnetic storms the inclusion of anomalous conductivity can double the total Pedersen conductance. This may help explain the overestimation of the cross-polar cap potentials by existing MHD codes. The turbulent conductivities and frictional heating presented in this paper should be included in global magnetospheric codes developed for predictive modeling of space weather.Comment: 13 pages, 5 figures, 2nd of two companion paper