Space Weather


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3-day Solar-Geophysical Forecast

Product: 3-Day Forecast - Issued: 2025 Apr 01 1230 UTC
Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center.

Geomagnetic Activity Observation and Forecast

The greatest observed 3 hr Kp over the past 24 hours was 2 (below NOAA Scale levels). The greatest expected 3 hr Kp for Apr 01-Apr 03 2025 is 2.67 (below NOAA Scale levels).

NOAA Kp index breakdown Apr 01-Apr 03 2025
Apr 01Apr 02Apr 03
00-03UT1.002.671.67
03-06UT1.332.671.67
06-09UT1.332.001.33
09-12UT1.002.001.33
12-15UT2.001.671.33
15-18UT2.001.671.33
18-21UT2.332.001.67
21-00UT2.002.331.33

Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No significant transient or recurrent solar wind features are forecast.

Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was above S-scale storm level thresholds.

Solar Radiation Storm Forecast for Apr 01-Apr 03 2025
Apr 01Apr 02Apr 03
S1 or greater99%35%25%

Rationale: The greater than 10 MeV proton flux is expected to persist above the S1 (Minor) threshold on 01 Apr. There is a chance for the levels to continue above the S1 level on 02-03 Apr.

Radio Blackout Activity and Forecast

Radio blackouts reaching the R2 levels were observed over the past 24 hours. The largest was at Apr 01 2025 0646 UTC.

Radio Blackout Forecast for Apr 01-Apr 03 2025
Apr 01Apr 02Apr 03
R1-R275%75%75%
R3 or greater25%25%25%

Rationale: R1-R2 (Minor-Moderate) radio blackouts are expected, with a chance for R3 (Strong) events on 01-03 Apr.


SOHO EIT 304
image-space-eit-304.jpg 		SOHO EIT 284
image-space-eit-284.jpg 		SDO/HMI Continuum
image-space-eit-284.jpg

The sun is constantly monitored for sun spots and coronal mass ejections. EIT (Extreme ultraviolet Imaging Telescope) images the solar atmosphere at several wavelengths, and therefore, shows solar material at different temperatures. In the images taken at 304 Angstrom the bright material is at 60,000 to 80,000 degrees Kelvin. In those taken at 171 Angstrom, at 1 million degrees. 195 Angstrom images correspond to about 1.5 million Kelvin, 284 Angstrom to 2 million degrees. The hotter the temperature, the higher you look in the solar atmosphere.


Northern Hemisphere Aurora
image-space-aurora-north.php 		Southern Hemisphere Aurora
image-space-aurora-south.php

Instruments on board the NOAA Polar-orbiting Operational Environmental Satellite (POES) continually monitor the power flux carried by the protons and electrons that produce aurora in the atmosphere. SWPC has developed a technique that uses the power flux observations obtained during a single pass of the satellite over a polar region (which takes about 25 minutes) to estimate the total power deposited in an entire polar region by these auroral particles. The power input estimate is converted to an auroral activity index that ranges from 1 to 10.


Latest LASCO Solar Corona
image-space-solar-corona.php
Large Angle and Spectrometric Coronagraph (LASCO). 		Real-Time Solar Wind
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Real-time solar wind data broadcast from NASA's ACE satellite.


solar101vhf.php
solargraph.php

Space weather images and information (excluded from copyright):

NOAA / NWS Space Weather Prediction Center
SOHO (ESA & NASA)

Space Weather links:

3-Day Forecast of Solar and Geophysical Activity
Space Weather Overview
LASCO Coronagraph
Real-Time Solar Wind
Space Weather Advisory Outlooks
Space Weather Forecast Disussions
Space Weather Alerts, Watches and Warnings
Solar and Heliospheric Observatory (SOHO)
The Very Latest SOHO Images

Space weather scripts courtesy of Mike Challis at Long Beach Weather.
3-day Solar-Geophysical Forecast text formatting by Jeremy Dyde at Jerbils Weather.
Additional features by Martin at Hebrides Weather and Ken True at Saratoga Weather.