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  1. Hansen Experimental Physics Laboratory (HEPL) exteriors

    Stanford (Calif.), December 4, 2007

    Hansen Experimental Physics Laboratory (HEPL) exteriors; taped to record building exteriors before HEPL was demolished in January 2008

  2. Extended Table 1 for ApJL Article "Why Is the Great Solar Active Region 12192 Flare-Rich But CME-Poor?"

    Sun, Xudong
    April 10, 2015

    Comparison of magnetic characteristics of three major active regions before and after major flare.

  3. Predicting Coronal Mass Ejections Using Machine Learning Methods

    Bobra, Monica G.
    January 25, 2016

    Of all the activity observed on the Sun, two of the most energetic events are flares and Coronal Mass Ejections (CMEs). Usually, solar active regions that produce large flares will also produce a CME, but this is not always true (Yashiro et al., 2005). Despite advances in numerical modeling, it is still unclear which circumstances will produce a CME (Webb & Howard, 2012). Therefore, it is worthwhile to empirically determine which features distinguish flares associated with CMEs from flares that are not. At this time, no extensive study has used physically meaningful features of active regions to distinguish between these two populations. As such, we attempt to do so by using features derived from [1] photospheric vector magnetic field data taken by the Solar Dynamics Observatory's Helioseismic and Magnetic Imager instrument and [2] X-ray flux data from the Geostationary Operational Environmental Satellite's X-ray Flux instrument. We build a catalog of active regions that either produced both a flare and a CME (the positive class) or simply a flare (the negative class). We then use machine-learning algorithms to [1] determine which features distinguish these two populations, and [2] forecast whether an active region that produces an M- or X-class flare will also produce a CME. We compute the True Skill Statistic, a forecast verification metric, and find that it is a relatively high value of 0.8 plus or minus 0.2. We conclude that a combination of six parameters, which are all intensive in nature, will capture most of the relevant information contained in the photospheric magnetic field. The code and data used to do this analysis are included here.


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