☀ SolarEvidence

The Sun, the evidence, and the arguments

Live solar and geomagnetic conditions next to a directory of solar-physics claims. Each claim is graded Mainstream Contested or Fringe, with the evidence for and against and the primary sources.

Planetary Kp index

1.67
3-hour interval starting 2026-10-21 12:00 UTC
Last 48 h. Kp ≥ 5 = geomagnetic storm (NOAA G1+). Data: NOAA SWPC planetary K-index (U.S. gov., public domain). What Kp means for aurora

Solar wind (L1)

Speed506 km/s
Density4.87 p/cm³
Bt9 nT
Bz (GSM)-6 nT
Updated 2026-10-21T15:24:00Z. A strongly southward (negative) Bz favours aurora. Data: NOAA SWPC real-time solar wind (DSCOVR/ACE; U.S. gov., public domain)

NOAA scales now

R0Radio blackout
S0Radiation storm
G0Geomagnetic storm
Data: NOAA SWPC NOAA scales (U.S. gov., public domain)

Latest SWPC alerts & warnings

  • 2026-10-21 04:29 UTC ALERT: Geomagnetic K-index of 4
  • 2026-10-21 02:05 UTC WARNING: Geomagnetic K-index of 4 expected
  • 2026-10-20 19:12 UTC WATCH: Geomagnetic Storm Category G1 Predicted
  • 2026-10-19 09:09 UTC SUMMARY: 10cm Radio Burst
  • 2026-10-18 17:24 UTC WATCH: Geomagnetic Storm Category G1 Predicted
  • 2026-10-17 20:14 UTC WATCH: Geomagnetic Storm Category G1 Predicted
Data: NOAA SWPC alerts (U.S. gov., public domain). Headlines only; read the full official alert at SWPC.

Recent flares and CMEs

NASA DONKI (2026-10-07 to 2026-10-21)

NASA DONKI could not be reached when this page was built. The browser is trying again now…

    NOAA GOES X-ray flares (7 days)

    • 2026-10-21 10:58 UTC peak class C1.3
    • 2026-10-21 08:20 UTC peak class B8.1
    • 2026-10-21 07:44 UTC peak class B7.6
    • 2026-10-21 03:33 UTC peak class B7.0
    • 2026-10-21 03:19 UTC peak class B7.5
    • 2026-10-21 01:10 UTC peak class B7.5
    • 2026-10-20 18:36 UTC peak class C1.4
    • 2026-10-20 13:56 UTC peak class C2.8
    Data: NASA CCMC DONKI (credit NASA CCMC/M2M SWAO); NOAA SWPC GOES X-ray flares (U.S. gov., public domain). CMEs explained

    Guides

    Aurora

    What the Kp index means for seeing the aurora

    Aurora

    How to see the northern lights in the US

    Aurora

    Best US places and times to see the aurora

    Space weather history

    The Carrington Event of 1859

    Space weather impacts

    Solar storms and the power grid

    Solar physics basics

    The solar cycle, explained

    Solar physics basics

    Coronal mass ejections (CMEs), explained

    Claims directory see all

    Fringe

    The Electric Sun hypothesis

    The Sun is powered mainly by external electric currents flowing through space, not by nuclear fusion in its core.

     Contested

    How strong would Solar Cycle 25 be? The prediction debate

    Solar Cycle 25 would be a weak cycle similar to Cycle 24 (the 2019 NOAA/NASA/ISES panel consensus). A competing 'terminator' method argued it could be one of the strongest on record.

     Fringe

    Will a grand solar minimum cause a 'mini ice age'?

    A grand solar minimum like the Maunder Minimum is coming in the next decades and will cause a 'mini ice age' that cancels out global warming.

     Fringe

    Electric comets (Electric Universe / Thunderblog claims)

    Comets are dry, rocky, electrically charged bodies whose jets, comas and surface features are produced by electric discharge with the Sun's environment, not by ices turning to gas in sunlight.

     Fringe

    Solar activity triggers earthquakes

    Solar activity, such as solar-wind surges, flares or geomagnetic storms, triggers large earthquakes, so space weather can be used to forecast them.

     Fringe

    The 'solar micronova' / solar flash

    The Sun undergoes a recurring 'micronova' outburst, roughly every 12,000 years, that will soon strike Earth and cause a global catastrophe alongside a geomagnetic pole shift.

    Data: NOAA SWPC solar-cycle indices, based on WDC-SILSO sunspot numbers. Solar Cycle 25 smoothed sunspot peak so far: 160.9 (2024-10). Latest monthly sunspot number: 60.3 (2026-09, preliminary).