Maybe there is some hope for SC24 ramping up this year yet. This appears to be the largest SC24 spot to date. Previous SC24 spots have faded quickly, we’ll see how long this one lasts.
UPDATE: 9/23 It is already fading fast, see this animation that I’ve produced.
In other news, Jan Jansens reports that SC23-24 continues to behave much more like cycles in the late 19th and early 20th century. See this:
h/t John Sumpton for the link
Also, courtesy Basil, a new way to look at sunspot numbers. This is a Morlet wavelet transform of smoothed sunspot numbers (SSN).
Click for the ful sized image
Time is read along the horizontal axis, and a time scale is drawn across the top of the image. Frequency is read on the verticle axis. The scale is 2**x months, where is is 1,2,3..9. So 2**7 is 128 months. I’ve drawn lines at approximately 11 yrs, 22 yrs, and 44 yrs. Amplitude is indicated by color. The basic 11 year Schwabe cycle is clearly indicated by the red ovals bisected by the line for 11 years. I’ve noted the Dalton Minimum, which is clearly different in character than the other cycles — with weaker and longer solar cycles. It is subtle, but you can see the weaker intensity of solar cycles 10-15 compared to solar cycles 16-23 in the weaker color of the earlier cycles. There is clearly enhanced activity, and of longer duration, at the end of the 20th century. Read the rest of this entry »
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