Category Archives: Magnetic Field

46. Spatially Resolved Coronal Magnetic Fields Derived Using Seismology Techniques Applied to Omnipresent Sunspot Waves

Contributed by David B. Jess. Posted on November 19, 2015

Omnipresent magneto-acoustic waves, originating from within the underlying sunspot and propagating radially outwards, allow the spatial variation of the local coronal magnetic field to be mapped with high precision.

38. Subsurface Structure of Pores and Sunspots

Contributed by Robert Stein. Posted on May 12, 2015

Numerical simulation of sunspots indicate that different subsurface structures are possible. They may be deep coherent flux tubes or twisted spaghetti or shallow structures. It may well be that all the models proposed for sunspot structures are correct for some spot somewhere.

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.