Forecast for 27 April 2025 at 4:35pm UTC.
Kp-index
The Kp-index is a scale used to measure geomagnetic activity. It ranges from 0 to 9, with higher values indicating greater geomagnetic activity.
Bz
Bz refers to the north-south orientation of the magnetic field embedded in the solar wind. A strong negative Bz is often associated with increased chances of seeing the Northern Lights.
Solar Wind Density
Solar wind density refers to the number of charged particles in a given volume of the solar wind, typically measured in particles per cubic centimeter (p/cm3).
Solar Wind Speed
Solar wind speed refers to the velocity at which charged particles are ejected from the Sun’s outer atmosphere, known as the corona.
Looking ahead, here are the forecast Kp-index values for the next 3 days from the NOAA.
| Time (UTC) | 27 April | 28 April | 29 April |
|---|---|---|---|
| 12am-3am | 1.33 | 3.67 | 2.67 |
| 3am-6am | 2.33 | 3.00 | 2.33 |
| 6am-9am | 1.33 | 2.67 | 2.00 |
| 9am-12pm | 1.33 | 2.00 | 2.00 |
| 12pm-3pm | 3.00 | 2.00 | 2.00 |
| 3pm-6pm | 4.00 | 1.67 | 1.67 |
| 6pm-9pm | 3.33 | 2.67 | 2.33 |
| 9pm-12am | 3.00 | 3.00 | 2.33 |
In the table Kp-index values including a “G” value indicate a geomagnetic storm. NOAA uses a geomagnetic storm scale (G1-G5) to classify the severity of geomagnetic storms, with G1 being minor, G2 moderate, G3 strong, G4 severe and G5 extreme.
Looking at the places we track, here’s our top 10 spots with the current highest likelihood of seeing the aurora.
Forecast for 27 April 2025 at 5:30pm UTC.
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