by Dr. Tony Phillips of Spaceweather.com
Anyone wondering why the sun has been so quiet lately? The reason may be found in the graph below. The 11-year sunspot cycle is crashing:
For the past two years, the sunspot number has been dropping as the sun transitions from Solar Max to Solar Min. Fewer sunspots means there are fewer solar flares and fewer coronal mass ejections (CMEs). As these explosions subside, we deem the sun “quiet.”
But how quiet is it, really?
A widely-held misconception is that space weather stalls and becomes uninteresting during periods of low sunspot number. In fact, by turning the solar cycle sideways, we see that Solar Minimum brings many interesting changes. For instance, the upper atmosphere of Earth collapses, allowing space junk to accumulate around our planet. The heliosphere shrinks, bringing interstellar space closer to Earth. And galactic cosmic rays penetrate the inner solar system with relative ease. Indeed, a cosmic ray surge is already underway. (Goodbye sunspots, hello deep-space radiation.)
Stay tuned for updates as the sunspot number continues to drop.