CME

## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI ) ## Message Type: Space Weather Notification - CME update (ensemble) (Missions Near Earth) ## ## Message Issue Date: 2026-06-06T20:44:57Z ## Message ID: 20260606-AL-005 ## ## Disclaimer: NOAA's Space Weather Prediction Center is the United States Government official source for space weather forecasts. This "Experimental Research Information" consists of preliminary NASA research products and should be interpreted and used accordingly. ## Summary: Ensemble modeling update on CME with ID 2026-06-06T14:11:00-CME-001 (see previous notifications 20260606-AL-001, 20260606-AL-004). Based on heliospheric ensemble modeling carried out at the Moon to Mars Space Weather Analysis Office, it is estimated that the CME may impact NASA missions near Earth. Out of 36 ensemble members (see notes section), 36 (100%) indicate impact at NASA missions near Earth. Ensemble simulations indicate that the leading edge of the CME will reach NASA missions near Earth between about 2026-06-08T01:01Z and 2026-06-08T13:57Z (average arrival 2026-06-08T06:50Z). The ensemble-based forecast indicates that there is a 63% chance for the maximum Kp index to be in the 6-8 range (moderate to severe). Links to the ensemble details of the modeled event: https://iswa.gsfc.nasa.gov/ENSEMBLE/2026-06-06_ncmes1_sims36_M2M-SWAO085/20260606_141100_ncmes1_sims36_M2M-SWAO085_anim_tim-den.gif https://iswa.gsfc.nasa.gov/ENSEMBLE/2026-06-06_ncmes1_sims36_M2M-SWAO085/20260606_141100_ncmes1_sims36_M2M-SWAO085_arrival_Earth.gif https://iswa.gsfc.nasa.gov/ENSEMBLE/2026-06-06_ncmes1_sims36_M2M-SWAO085/20260606_141100_ncmes1_sims36_M2M-SWAO085_Earth_stack.gif ## Notes: The CME event with ID 2026-06-06T14:11:00-CME-001 is also predicted to impact Lucy at 2026-06-16T22:14Z, BepiColombo at 2026-06-07T03:06Z, Europa Clipper at 2026-06-09T12:45Z, and OSIRIS-APEX at 2026-06-08T20:06Z, Juice at 2026-06-10T05:00Z (glancing blow), and STEREO A at 2026-06-09T02:00Z (glancing blow) (plus minus 7 hours) based on previous heliospheric modeling (see notifications 20260606-AL-001, 20260606-AL-004). This CME event (2026-06-06T14:11:00-CME-001) is associated with an M1.8 flare from Active Region 14461 (S22E24) with ID 2026-06-06T13:40:00-FLR-001 which peaked at 2026-06-06T14:01Z. Ensemble CME modeling at M2M is performed by building sets of initial CME parameters and carrying out separate simulations for each set. This approach allows a mapping of initial CME parameter uncertainties into a statistical characterization of CME arrival times and impact at locations of interest. Description of links: For each location, the first link shows the WSA-ENLIL+Cone model animation for the median CME input parameters, the second link shows the probabilistic distribution of predicted arrival times histogram, and the third link shows a stack plot of the WSA-ENLIL+Cone modeled magnetic field, velocity, density, and temperature for all ensemble members. For missions near Earth, a histogram of the probabilistic Kp forecast is also provided. For the full details of the modeled event, please go here: https://iswa.gsfc.nasa.gov/ENSEMBLE/2026-06-06_ncmes1_sims36_M2M-SWAO085/Detailed_results_20260606_141100_ncmes1_sims36_M2M-SWAO085.txt ###