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| Warnings and Alerts | |
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Issue Time: 2026 Oct 25 0927 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu Continuation of Serial Number: 3756 Begin Time: 2026 Oct 23 1140 UTC Yesterday Maximum 2MeV Flux: 3259 pfu Max time: 2026 Oct 24 1530 UTC Space Weather Scales |
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| Current Condition and Alerts | |
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Issued: 2026 Oct 25 1205 UTC
Prepared
by the US Dept. of Commerce, NOAA, Space Weather Prediction
Center
Geophysical Alert Message Solar-terrestrial indices for 24 October follow. Solar flux 93 and estimated planetary A-index 5. The estimated planetary K-index at 1200 UTC on 25 October was 1.00. No space weather storms were observed for the past 24 hours. No space weather storms are predicted for the next 24 hours. Space Weather Scales |
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| Forecast Discussion | |
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Issued: 2026 Oct 25 1230 UTC
Prepared
by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction
Center
Solar Activity .24 hr Summary... Solar activity was at very low levels in the past 24h, with few B-class flares from the only numbered Region 4560 (N13W77, Fao/beta-gamma). Region 4560 presented some decay in its intermediary spots as continued to approach the West limb. Two spotless plage regions were observed but not yet numbered during the period: one in the NE quadrant and the other in the SW. Eruptions were observed beyond the NE limb in SUVI imagery and associated with two CMEs first seen in LASCO/C2 imagery around 25/0312 UTC and 25/0636 UTC. No Earth-directed component is expected from these events. No new Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... Solar activity is likely to remain at very-low to low levels through 27 Oct, with a slight chance for isolated M-class flares (R1-R2, Minor-Moderate). Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux reached high levels, with a peak flux of 3,259 pfu observed at 24/1530 UTC. The greater than 10 MeV proton flux remained steady at background levels. .Forecast... The greater than 2 MeV electron flux is expected to continue reaching high levels through 27 Oct. The greater than 10 MeV proton flux is anticipated to persist at background levels through 27 Oct. Solar Wind .24 hr Summary... Solar wind parameters continued reflecting undisturbed conditions near Earth. Total magnetic field strength (Bt) remained below 5 nT, with no significant periods of southward Bz observed. Solar wind speeds declined to about 350 km/s early 25 Oct and slightly oscillated around this level until the end of the reported period. Phi angle became variable after 24/1240 UTC, with a sustained ~ 3h period of negative sector (oriented toward the Sun) around 25/1600-1900 UTC, followed by a predominant positive sector (away from the Sun) period. .Forecast... Enhanced solar wind conditions are likely on 25-26 Oct due to combined influences of a small, negative polarity CH HSS and possible glancing CME effects from the 21 Oct eruptions. Nominal conditions are expected to return on 27 Oct. Geospace .24 hr Summary... The geomagnetic activity was at quiet levels during the period. .Forecast... Periods of active conditions, with a chance for G1 (Minor) storming, are possible on 25 Oct due to combined effects from a negative polarity coronal hole and potential glancing CME impacts. Quiet to unsettled conditions are likely on 26-27 Oct. Space Weather Scales |
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| Three Day Forecast | |
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Issued: 2026 Oct 25 1230 UTC
Prepared
by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction
Center
A. NOAA 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 Oct 25-Oct 27 2026 is 4.00 (below NOAA Scale levels). NOAA Kp index breakdown Oct 25-Oct 27 2026 Oct 25 Oct 26 Oct 27 00-03UT 0.67 3.00 1.67 03-06UT 0.67 2.00 1.33 06-09UT 0.33 2.00 1.33 09-12UT 1.00 2.00 1.33 12-15UT 4.00 2.00 1.33 15-18UT 3.33 2.00 1.33 18-21UT 4.00 2.00 1.67 21-00UT 3.00 2.33 1.67 Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No significant transient or recurrent solar wind features are forecast. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for Oct 25-Oct 27 2026 Oct 25 Oct 26 Oct 27 S1 or greater 1% 1% 1% Rationale: No S1 (Minor) or greater solar radiation storms are expected. No significant active region activity favorable for radiation storm production is forecast. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Oct 25-Oct 27 2026 Oct 25 Oct 26 Oct 27 R1-R2 10% 10% 10% R3 or greater 1% 1% 1% Rationale: There is a slight chance for R1-R2 (Minor-Moderate) radio blackouts through 27 Oct. Space Weather Scales |
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| Weekly Highlights and Forecasts | |
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Issued: 2026 Oct 19 0141 UTC
Prepared
by the US Dept. of Commerce, NOAA, Space Weather Prediction
Center
Highlights of Solar and Geomagnetic Activity 12 - 18 October 2026 Solar activity reached moderate levels on 16 Oct when Region 4551 (S15, L=102, class/area=Eki/620 on 15 Oct) produced an M1.3 flare (R1-Minor) at 16/1542 UTC, the largest flare of the week. Solar activity was at low levels with C-class flare activity throughout the remainder of the period. No Earth-directed CMEs were observed. No proton events were observed at geosynchronous orbit. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels on 16 Oct, with normal to moderate levels observed throughout the remainder of the week. The geomagnetic field was at quiet to unsettled levels on 12-15 and 17 Oct, with active levels observed on 16 Oct, due primarily to negative polarity CH HSS influences. Quiet conditions were observed on 18 Oct. Forecast of Solar and Geomagnetic Activity 19 October - 14 November 2026 Solar activity is expected to predominately low with M-class flare probabilities ranging between a slight chance to a chance throughout the outlook period. No proton events are expected at geosynchronous orbit. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach high levels on 23-27 Oct and 01-04 Nov, with normal to moderate levels likely the prevail throughout the remainder of the period. Geomagnetic field activity is likely to reach G1 (Minor) storm levels on 19-20 Oct and 31 Oct-01 Nov, with active conditions likely on 21 and 24 Oct and 09 Nov, due to CH HSS influences. Quiet and quiet to unsettled levels are expected to prevail throughout the remainder of the outlook period. Space Weather Scales |
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| About AIA Images | |
| The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO) is designed to provide an unprecedented view of the solar corona, taking images that span at least 1.3 solar diameters in multiple wavelengths nearly simultaneously, at a resolution of ~ 1 arcsec and at a cadence of 10 s or better. The primary goal of the AIA Science Investigation is to use these data, together with data from other SDO instruments and from other observatories, to significantly improve our understanding of the physics behind the activity displayed by the Sun's atmosphere, which drives space weather in the heliosphere and in planetary environments. The AIA will produce data required for quantitative studies of the evolving coronal magnetic field, and the plasma that it holds, both in quiescent phases and during flares and eruptions; the AIA science investigation aims to utilize these data in a comprehensive research program to provide new understanding of the observed processes Left Click Image for screen size, Right Click Image and open in new tab for full size. | |
| Daily Image AIA 171 | |
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| Daily Image AIA 171 PFSS Model | |
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| Daily Image AIA 193 | |
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| Daily Image AIA 304 | |
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| Daily Video AIA 171 | |
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| Daily Video AIA 171 PFSS Model | |
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| Daily Video AIA 193 | |
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| Daily Video AIA 304 | |
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| About the HMI Images | |
| (Helioseismic and Magnetic Imager) HMI is an instrument designed to study oscillations and the magnetic field at the solar surface, or photosphere. HMI is one of three instruments on the Solar Dynamics Observatory; together, the suite of instruments observes the Sun nearly continuously and takes a terabyte of data a day. HMI observes the full solar disk at 6173 Å with a resolution of 1 arcsecond. HMI is a successor to the Michelson Doppler Imager on the Solar and Heliospheric Observatory. This is very much how the Sun looks like in the visible range of the spectrum (for example, looking at it using special 'eclipse' glasses: Remember, do not ever look directly at the Sun!). The magnetogram image shows the magnetic field in the solar photosphere, with black and white indicating opposite polarities. Left Click Image for screen size, Right Click Image and open in new tab for full size. | |
| Daily Image HMI Continuum | |
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| Daily Image HMI Magnetogram | |
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| Daily Video HMI Continuum | |
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| Daily Video HMI Magnetogram | |
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| About LASCO Images | |
| LASCO (Large Angle Spectrometric Coronagraph) is able to take images of the solar corona by blocking the light coming directly from the Sun with an occulter disk, creating an artificial eclipse within the instrument itself. The position of the solar disk is indicated in the images by the white circle. The most prominent feature of the corona are usually the coronal streamers, those nearly radial bands that can be seen both in C2 and C3. Occasionally, a coronal mass ejection can be seen being expelled away from the Sun and crossing the fields of view of both coronagraphs. The shadow crossing from the lower left corner to the center of the image is the support for the occulter disk. C2 images show the inner solar corona up to 8.4 million kilometers (5.25 million miles) away from the Sun. C3 images have a larger field of view: They encompass 32 diameters of the Sun. To put this in perspective, the diameter of the images is 45 million kilometers (about 30 million miles) at the distance of the Sun, or half of the diameter of the orbit of Mercury. Many bright stars can be seen behind the Sun. Left Click Image for screen size, Right Click Image and open in new tab for full size. | |
| Combined C2 C3 and AIA 304 | |
| No LASCO Data | |
| Log Polar View C2 C3 and AIA 304 | |
| No LASCO Data | |
| Combined C2 C3 and AIA 304 Video | |
| No LASCO Data | |
| Log Polar View C2 C3 and AIA 304 Video | |
| No LASCO Data | |
| Space Weather Videos | |
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| Space Weather Information | |
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Demystifying Space Weather An article by Scientific Frontline Informative information and glossary about “Space Weather” Space weather has become increasingly important in our modern world due to our growing reliance on technology. It can impact various aspects of our daily lives, from communication and navigation systems to power grids and even astronaut safety. In this deep dive, we'll explore the intricacies of space weather, its causes, its effects, and why understanding it is crucial in our technology-dependent society. |
