Category Archives: Magnetic Field
37. Why is the Great Solar Active Region 12192 Flare-Rich but CME-Poor?
34. Bimodal Distribution of Magnetic Fields and Areas of Sunspots
33. Comparing nonlinear force-free and potential field modeling using full-disk HMI data
32. The Polar Field Reversal of Solar Cycle 24
31. The Photospheric Size-Flux Distribution and its Relationship with the Small-Scale and Global Components of the Solar Dynamo
30. Surface and Coronal Field Signatures of Implosions in Two Homologous Solar Flares
29. The STARA Sunspot Catalog
The STARA catalog of sunspot properties from the SOHO/MDI and SDO/HMI data is presented and discussed. For STARA, an automated detection algorithm is employed to compile the first sunspot record from space-based instruments. This catalog is publicly available at http://www.nso.edu/staff/fwatson/STARA.
25. Solar Flare Forecasting Using HMI Vector Magnetic Field Data with a Support Vector Machine Algorithm
We attempt to forecast M- and X-class solar flares using a support vector machine algorithm and 4 years of HMI vector magnetic field data. With the true skill statistic as the preferred metric to estimate the algorithm performances, we obtain good predictive abilities. This may be partly due to fine-tuning the algorithm for this purpose, and to a choice of 13 SHARP parameters obtained from vector magnetograms.