Daily Sun: 18 Dec 25

Current Auroral Oval:

Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation Planetary K-index
Now: Kp= 4.33 unsettled
24-hr max: Kp= 4.67 unsettled
explanation | more data
Interplanetary Mag. Field
B_total: 5.00 nT
B_z: -3.33 nT south
more data: ACE, DSCOVR
Updated: Today at 0551 UT Coronal Holes: 18 Dec 25
Earth is inside a stream of solar wind flowing from this coronal hole. Credit: NASA/SDO | more data

Spotless Days
Current Stretch: 0 days
2025 total: 0 days (0%)
2024 total: 0 days (0%)
2023 total: 0 days (0%)
2022 total: 1 day (<1%)
2021 total: 64 days (18%)
2020 total: 208 days (57%)
2019 total: 281 days (77%)
2018 total: 221 days (61%)
2017 total: 104 days (28%)
2016 total: 32 days (9%)
2015 total: 0 days (0%)
2014 total: 1 day (<1%)
2013 total: 0 days (0%)
2012 total: 0 days (0%)
2011 total: 2 days (<1%)
2010 total: 51 days (14%)
2009 total: 260 days (71%)
2008 total: 268 days (73%)
2007 total: 152 days (42%)
2006 total: 70 days (19%)
Updated 18 Dec 2025

Thermosphere Climate Index
today: 21.40x10¹⁰ W Warm
Max: 49.4x10¹⁰ W Hot (10/1957)
Min: 2.05x10¹⁰ W Cold (02/2009)
explanation | more data: gfx, txt
Updated 17 Dec 2025

The Radio Sun
10.7 cm flux: 119 sfu
explanation | more data
Updated 18 Dec 2025

Cosmic Rays Solar Cycle 25 is near its peak, and this is reflected in the number of cosmic rays entering Earth's atmosphere. Neutron counts from the University of Oulu's Sodankyla Geophysical Observatory show that cosmic rays reaching Earth are slowly declining--a result of the yin-yang relationship between the solar cycle and cosmic rays.

Oulu Neutron Counts
Percentages of the Space Age average:
today: -10.3% Very Low
48-hr change: -0.2%
Max: +11.7% Very High (12/2009)
Min: -32.1% Very Low (06/1991)
explanation | more data
Updated 18 Dec 2025 @ 0700 UT