Here are some cool pictures and videos as well as some amazing photos
of the 2017 Solar Eclipse. Thanks!!!!
AFT Baseline 2015.The AFT Baseline assimilates the magnetic field from magnetograms
(region indide of the ring) and advects the field using the obseved surface flows to
provide a picture of the evolution of the photospheric magnetic field configuration
of the entire Sun for a singe instant in time. In this video, we see this evolution
for 2015, just after Solar Cycle 24 maximum.
Solar Cycle 24 Supersaturated Polar Field Reversal. There has been considerable
chatter about the "triple reversal" of the Sun's North pole during Solar Cycle 24.
From this video, it seem that the extra reversals may not be true reversals. It
appears that the reversal from negative to positive (blue to yellow) completes
at about September of 2013. Afterward we see a blue leading polarity stream that
makes its way North. While at times it does appear to dominate the 55 and 75
degree rings, it doesn't ever appear to dominate the 85 degree ring - thus our
assessment that there was only a single "true reversal" in the northern hemisphere.
Solar Cycle 24 Supersaturated Polar Field Reversal. For the South, data assimilation only
goes up to the end of 2014. After that, I let the AFT continue for a few months so you'll
notice the distinct absence of the HMI data being added during the end of the video. (You
may also notice that it continues through the end of May, i.e. into the future at the time
this movie was made.) An aspect
that is particularly evident in the South Pole movie, is the presence and persistence of
the active longitudes. Seen in the outer edge of the Sun, the large scale flux pattern
stays largely unchanged or evolves very slowly as the HMI assimilation passes by.
Discover Eclipse 2017!
In his spare time Dr. David Hathaway is an avid photogropher.
He recently traveled to Salem, OR to view the 2017 Solar Eclipse. Please enjoy these beautiful
pictures that he created using a digital SLR camera with a 400mm lens at f/8 set at ISO 400: