141. Source Depth of Three-minute Umbral Oscillations
Apparent 3-min waves observed inside sunspot umbrae are modeled as excited about 1000 to 2000 km beneath sunspots’ surface.
Tag Archives: sunspot
65. SDO Reveals the Properties of Flare-productive Sunspot Regions
A statistical study of sunspot region properties yields insights on why some are flare-productive.
64. Slow Appearance of Sunspots Challenges Theory
A comparison of the surface flow patterns in observation and numerical simulation suggests that the flux tube emerging speed has been overestimated in theories.
52. F10.7 Microwave Flux Matches the Total Disk Unsigned Magnetic Flux from MDI and HMI
The F10.7 microwave flux shows remarkabke agreement with the unsigned magnetic flux from MDI and HMI over the past 20 years, attesting to the accuracy and significance of both.
48. Polar Cap Magnetic Field Reversals During Solar Grand Minima: Could Pores Play a Role?
Tiny sunspots, or pores, might have escaped the observers during the Maunder minimum. However, they might have carried enough magnetic flux for the normal operation of a Babcock-Leighton-type dynamo.
46. Spatially Resolved Coronal Magnetic Fields Derived Using Seismology Techniques Applied to Omnipresent Sunspot Waves
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.