SatBench Space Weather

Last updated: Dec 29, 2025 2:29:22 AM EST • Cache: OK

Right now (simple)

This is the “what should I care about?” view. No jargon required.

R1MinorS0NoneG0None Kp 2.67Geomagnetic activity LowOverall impact LowAurora (NJ) PoorHF Radio

Mostly quiet conditions. Little to no impact expected for most people.
Radio blackout activity is present (mainly affects HF/shortwave on the sunlit side).

Aurora (NJ)

Low — Geomagnetic conditions are calm. Aurora is unlikely this far south tonight.

Overall impact

Low — Mostly quiet—little to no impact expected for most people.

HF radio conditions

Poor — Radio blackout activity is present—HF reliability may be reduced.

Sun → Earth status

Possible — A CME/Type II signature was mentioned (can lead to geomagnetic impacts later).

Satellite risk

Normal — No notable radiation storm activity—satellite risk is typical.

What changed recently

Up — Kp is higher than ~24 hours ago.
No new bulletins since last visit.

Observed stamp (UTC): 2025-12-28 07:29:00 • Next-day outlook: R? / S? / G0

Geomagnetic Activity (Kp)

Kp updates in 3-hour blocks (0–9). Higher Kp increases aurora odds and can make radio/GPS less stable.

Kp 2.67

Last block: Dec 28, 2025 10:00 PM EST

Latest solar flare (GOES)

Flares are labeled A/B/C/M/X (X strongest). Strong flares can affect HF radio on the daylight side.

M1.0Flare class Dec 29, 2025 1:51 AM ESTPeak time

Medium. Radio blackouts possible on sunlit side; CME could mean later geomagnetic activity.

Begin: Dec 29, 2025 1:34 AM EST • End: Dec 29, 2025 1:56 AM EST

View flare history

Important alerts (short list)

Only the most relevant bulletins are shown here (max 5). Open an item to see the official wording.

Plain English: HF/shortwave reliability may drop on affected (often sunlit) paths.

Space Weather Message Code: SUMXM5
Serial Number: 302
Issue Time: 2025 Dec 27 0215 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Dec 27 0138 UTC
Maximum Time: 2025 Dec 27 0150 UTC
End Time: 2025 Dec 27 0159 UTC
X-ray Class: M5.1
Location: S09E73
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

Plain English: A CME/eruption can lead to geomagnetic impacts later if Earth-directed.

Space Weather Message Code: ALTTP2
Serial Number: 1460
Issue Time: 2025 Dec 27 0204 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 27 0147 UTC
Estimated Velocity: 788 km/s



Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.

Plain English: HF/shortwave reliability may drop on affected (often sunlit) paths.

Space Weather Message Code: ALTXMF
Serial Number: 506
Issue Time: 2025 Dec 27 0150 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Dec 27 0148 UTC
NOAA Scale: R2 - Moderate

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.

Plain English: Possible aurora + some radio/GPS disruption during stronger storms.

Space Weather Message Code: WARK04
Serial Number: 5197
Issue Time: 2025 Dec 24 2052 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5196
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 25 1200 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.

Plain English: Possible aurora + some radio/GPS disruption during stronger storms.

Space Weather Message Code: WARK05
Serial Number: 2164
Issue Time: 2025 Dec 24 0849 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2163
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 24 1800 UTC
Warning Condition: Persistence

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

View all alerts