Monthly Archives: January 2015

34. Bimodal Distribution of Magnetic Fields and Areas of Sunspots

Contributed by Andrey G. Tlatov and Alexei A. Pevtsov. Posted on January 27, 2015

Are all sunspots created equal or are some sunspots formed by a different mechanism than others? High quality observations from the Helioseismic Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) suggest bimodal distribution in properties of sunspots.

33. Comparing nonlinear force-free and potential field modeling using full-disk HMI data

Contributed by Tilaye Tadesse. Posted on January 23, 2015

We present potential filed and nonlinear force-free magnetic field (NLFFF) extrapolations of full-disk magnetogram observed by SDO/HMI instrument. The study shows that NLFFF model agrees significantly better with coronal magnetic loops as observed in SDO/AIA images.