The approaching solar cycle 24 minimum continues the long slide in solar activity

Guest essay by Javier Solar cycle 24 is ending and we are approaching a time of minimal solar activity between solar cycles 24 and 25, known as a solar minimum. Despite claims that we understand how the Sun works, our solar predictive skills are still wanting, and the Sun continues to be full of surprises.…

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New paper from Judith Lean estimates Solar Irradiance Since 850 CE

Estimating Solar Irradiance Since 850 CE J. L. Lean Abstract Solar total and spectral irradiance are estimated from 850 to 1610 by regressing cosmogenic irradiance indices against the National Oceanic and Atmospheric Administration Solar Irradiance Climate Data Record after 1610. The new estimates differ from those recommended for use in the Paleoclimate Model Intercomparison Project…

NASA: Sunspots Vanishing Faster than Expected

by Dr. Tony Philips, NASA Spaceweather Sunspots are becoming scarce. Very scarce. So far in 2018 the sun has been blank almost 60% of the time, with whole weeks going by without sunspots. Today’s sun, shown here in an image from NASA’s Solar Dynamics Observatory, is typical of the featureless solar disk: The fact that…

Where Rivers Run North

Guest Post by Willis Eschenbach [See updates at the end] In the continental US, most of the rivers run east, west, or south. But in the Yukon and in Alaska, a number of them run north. The Yukon is a most curious river. The source of the Yukon in Lake Bennett in the Yukon Territory…

Solar Activity Flatlines: Weakest solar cycle in 200 years

By Frank Bosse and Prof. Fritz Vahrenholt, No Tricks Zone In March our supplier of energy was more inactive than in the previous months. The sunspot number was only 2,5, which is only 8% of what is normal for this month into the average cycle (month 112).Only solar cycles 5 and 6 were weaker. A sunspot…

Solar activity crashes – the Sun looks like a cueball

Right now, the sun is a cueball, as seen below in this image today from the Solar Dynamics Observatory (SDO) and has been without sunspots for 10 days. So far in 2018, 61% of days have been without sunspots. Via Robert Zimmerman, Behind The Black On Sunday NOAA posted its monthly update of the solar cycle, covering…

Clouds Down Under

Guest Post by Willis Eschenbach [See Update at the end] Sometimes climate research is just plain funny. I wrote before about Irish rain and investigated whether there is any effect on the rain from the solar variations linked to sunspots. I was looking for evidence that the Svensmark hypothesis is true. Svensmark said that changes…

Tools to Spot the Spots

Guest Post by Willis Eschenbach People have asked about the tools that I use to look for any signature of sunspot-related solar variations in climate datasets. They’ve wondered whether these tools are up to the task. What I use are periodograms and Complete Ensemble Empirical Mode Decomposition (CEEMD). Periodograms show how much strength there is…