Quiet sun sets new record for spotless days

As of November 1st, the current stretch of days without any observable sunspots in solar cycle 24 has reached a total of 228 spotless days in 2019 so far That’s 75% of the year so far. During the 2008 solar minimum, there were 268 days without sunspots, or 73% of the year. Here’s a tally of spotless…

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25 for 25

Guest post by David Archibald Back on March 7, 2006, the National Science Foundation issued a press release predicting that the amplitude of Solar Cycle 24 would be “30 to 50 percent stronger” than Solar Cycle 23. Solar Cycle 23 had a smoothed maximum amplitude of 180.3. The press release described the forecast as “unprecedented”.…

Solar Update July 2019

Guest Post by David Archibald The two major items of interest are the likely month of minimum in the Solar Cycle 24 – 25 transition and the likely amplitude of Solar Cycle 25. The latter can be derived from the solar polar magnetic field strength. Figure 1 following indicates that 25 is likely to be…

A record of the sun left on the moon

From NASA Goddard: Summary: The Sun’s rotation rate in its first billion years is unknown. Yet, this spin rate affected solar eruptions, influencing the evolution of life. A team of NASA scientists think they’ve figured it out by using the Moon as critical evidence. NASA’s Solar Dynamics Observatory captured this image of a solar flare…

Three solar storms headed for Earth

NOAA forecasters say there is a 55% to 60% chance of geomagnetic storms on May 15th and 16th when a series of coronal mass ejections (CMEs) could hit Earth’s magnetic field. Storm levels are expected to range between category G1 and G2. This means auroras could be sighted in northern-tier US states such as Montana,…