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Prediction for CME (2023-03-20T14:42:00-CME-001)

CME Observed Time: 2023-03-20T14:42Z
CME Note: Bright, wide and asymmetrical shape CME seen to the NE in SOHO and STEREO A coronagraphs. The eruption is characterized by an erupting sigmoid/S-shaped structure centered around N27E20, though dimming and an EUV wave signature is limited to longitudes closer to 30-50 degrees east. On arrival signature from Tarik Salman, LASSOS: background solar wind is quite different from normal levels with higher density (normal density around 5/cc) and speed (normal speed around 350-400 km/s)-a possible reason for this ICME not to have an associated shock. The start of the magnetic flux rope likely coincides with the enhancement in the total field and drop in density and the end of it is around 2023-04-24T09Z (based on an increase in temperature beyond this point and the field components becoming less coherent)
CME Shock Arrival Time: 2023-03-23T09:10Z
Observed Geomagnetic Storm Parameters due to CME:

Predicted Arrival Time: 2023-03-23T11:20Z (-5.0h, +7.0h)
Confidence that the CME will arrive: 87.0%
Predicted geomagnetic storm max Kp range due to CME: 3.0 - 5.0
Prediction Method: Ensemble WSA-ENLIL + Cone (NASA M2M)
Prediction Method Note:
## Community Coordinated Modeling Center Database Of Notifications, Knowledge, Information ( CCMC DONKI )
## Message Type: Space Weather Notification - CME update (ensemble) (Mars, Solar Orbiter, STEREO A, Lucy, Missions Near Earth)
## Message Issue Date: 2023-03-22T13:05:52Z
## Message ID: 20230322-AL-001
## 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.

Ensemble modeling estimates the spread/uncertainty in CME arrival time predictions using the WSA-ENLIL+Cone model due to uncertainties in CME input parameters.  This is achieved by measuring N CME input parameters, then performing an ensemble of N runs of WSA-ENLIL cone model.  This gives an ensemble of N CME arrival times and impact estimates.

ENLIL version: 2.7
Resolution: low2 (256x30x90)
Ambient settings: a3b1f
WSA version: 2.2
(Enlil 2.7 w/res:low2 ambient:a3b1f, WSA2.2)

Please enter a copy of the entire notification here:
## Summary:


Ensemble modeling update on CME with ID 2023-03-20T14:42:00-CME-001 (see previous notification 20230320-AL-002). Based on analysis by the Moon to Mars Space Weather Analysis Office and heliospheric ensemble modeling carried out at the Community Coordinated Modeling Center, it is estimated that the CME may impact STEREO A and Mars. For 24 ensemble members (see notes section), simulations indicate that the leading edge of the CME will reach:

- STEREO A between about 2023-03-23T04:18Z and 2023-03-23T14:26Z (average arrival 2023-03-23T08:08Z) for 100% of simulations.
- Mars between about 2023-03-25T15:53Z and 2023-03-26T06:30Z (average arrival 2023-03-26T01:27Z) for 91% of simulations.

Additionally the CME is estimated to reach NASA missions near Earth between about 2023-03-23T06:12Z and 2023-03-23T18:23Z (average arrival 2023-03-23T11:20Z) for 87% of simulations.  The ensemble-based forecast indicates that there is a 95% chance for the maximum Kp index to be in the 3-5 range (below minor to minor).

Links to the ensemble details of the modeled event:

## Notes:
This CME event (2023-03-20T14:42:00-CME-001) is also predicted to reach Solar Orbiter at 2023-03-21T22:07Z and Lucy at 2023-03-25T23:00Z (plus minus 7 hours) based on previous heliospheric modeling (see notification 20230320-AL-002).

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:
Lead Time: 63.42 hour(s)
Difference: -2.17 hour(s)
Prediction submitted by Anna Chulaki (M2M Office) on 2023-03-20T17:45Z
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If you are looking for the official U.S. Government forecast for space weather, please go to NOAA's Space Weather Prediction Center ( This "Experimental Research Information" consists of preliminary NASA research products and should be interpreted and used accordingly.

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