Student Paper: Nonparametric causal inference for bivariate time serie

James M. McCracken and Robert S. Weigel

Phys. Rev. E 93, 022207 – Published 8 February 2016

We introduce new quantities for exploratory causal inference between bivariate time series. The quantities, called penchants and leanings, are computationally straightforward to apply, follow directly from assumptions of probabilistic causality, do not depend on any assumed models for the time series generating process, and do …

Student Article: History’s Greatest Comet Finder

By Karl Battams (a scientist at NRL who is doing a PhD with a concentration in Space Weather at GMU)

I have a curious claim to fame. I have almost certainly seen more individual images of comets than any person in history. A good ballpark estimate would be around 50,000 unique images of comets, but that may be slightly on the …

Student Paper: Convergent cross-mapping and pairwise asymmetric inference

James M. McCracken and Robert S. Weigel

Convergent cross-mapping (CCM) is a technique for computing specific kinds of correlations between sets of times series. It was introduced by Sugihara et al. [Science 338, 496 (2012).] and is reported to be “a necessary condition for causation” capable of distinguishing causality from standard correlation. We show that the relationships between CCM correlations …

Student Paper: Removal of pseudo-convergence in coplanar and near-coplanar Riemann problems of ideal magnetohydrodynamics solved using finite volume schemes

A.D. Kercher and R.S. Weigel

Numerical schemes for ideal magnetohydrodynamics (MHD) that are based on the standard finite volume method (FVM) exhibit pseudo-convergence in which irregular structures no longer exist only after heavy grid refinement. We describe a method for obtaining solutions for coplanar and near-coplanar cases that consist of only regular structures, independent of grid refinement. The method, referred to …

Stream Processing for Solar Physics Paper

Karl Battams:

Modern advances in space technology have enabled the capture and recording of unprecedented volumes of data. In the field of solar physics this is most readily apparent with the advent of the Solar Dynamics Observatory (SDO), which returns in excess of 1 terabyte of data daily. While we now have sufficient capability to capture, transmit and store this …

Dissertation Completion Awards – Spring 2014

To All,
If your PhD student are planning to finish this upcoming Spring 2014 semester and you might need the Completion Award.  Please let Bob  know and please send us a statement tell us something about the student’s research and a note stating that the student is on track to finish his/her degree in the Spring 2014 semester.

see email from Cody …

Local High School Science Fair Winner on Space Weather Investigation!

A local high school student, Sahana Rao, from Centreville High School recently won science fair at the school-based level and moved on to Fairfax County Regional Science & Engineering Fair that took place on March 15-17, 2013. Her project involved analysis of Space Weather forecasts from

Student project: John Lear

John Lear is working with John Mariska measuring the variability of the Hinode EUV Imaging Spectrometer solar coordinate system as a function of time by comparing images taken with EIS and the AIA experiment on the Solar Dynamics Observatory.

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