CME Scoreboard

Prediction for CME (2021-08-24T13:25:00-CME-001)

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.

NASA GSFC SWRC ENLIL settings:
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:
Based on analysis by the Moon to Mars Space Weather Office and heliospheric ensemble modeling carried out at the Community Coordinated Modeling Center, it is estimated that the CME may impact STEREO A. For 48 ensemble members (see notes section), simulations indicate that the leading edge of the CME will reach:

- STEREO A between about 2021-08-27T07:55Z and 2021-08-27T15:21Z (average arrival 2021-08-27T11:58Z) for 35% of simulations.

Additionally the CME is estimated to reach NASA missions near Earth between about 2021-08-27T16:21Z and 2021-08-28T05:41Z (average arrival 2021-08-27T23:39Z) for 68% of simulations.  The ensemble-based forecast indicates that there is a 86% chance for the maximum Kp index to be in the 3-4 range (below minor to below minor).

Links to the ensemble details of the modeled event:
https://iswa.gsfc.nasa.gov/ENSEMBLE/2021-08-24_ncmes1_sims48_HILOX088/20210824_132500_ncmes1_sims48_HILOX088_anim_tim-den.gif
https://iswa.gsfc.nasa.gov/ENSEMBLE/2021-08-24_ncmes1_sims48_HILOX088/20210824_132500_ncmes1_sims48_HILOX088_arrival_Earth.gif
https://iswa.gsfc.nasa.gov/ENSEMBLE/2021-08-24_ncmes1_sims48_HILOX088/20210824_132500_ncmes1_sims48_HILOX088_Earth_stack.gif
https://iswa.gsfc.nasa.gov/ENSEMBLE/2021-08-24_ncmes1_sims48_HILOX088/20210824_132500_ncmes1_sims48_HILOX088_probabilistic_Kp_forecast_wdist.gif
https://iswa.gsfc.nasa.gov/ENSEMBLE/2021-08-24_ncmes1_sims48_HILOX088/20210824_132500_ncmes1_sims48_HILOX088_arrival_STA.gif
https://iswa.gsfc.nasa.gov/ENSEMBLE/2021-08-24_ncmes1_sims48_HILOX088/20210824_132500_ncmes1_sims48_HILOX088_STA_stack.gif

## Notes:
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/2021-08-24_ncmes1_sims48_HILOX088/Detailed_results_20210824_132500_ncmes1_sims48_HILOX088.txt

CCMC Rules of the Road: CCMC requests that users notify the CCMC, CME model/technique developers and submitting forecasters/researchers before performing event and validation studies with data from the CME Arrival Time Scoreboard. It is recommended that such studies be performed with the knowledge and collaboration of developers and submitting forecasters/researchers.

If you are looking for the official U.S. Government forecast for space weather, please go to NOAA's Space Weather Prediction Center (https://swpc.noaa.gov). This "Experimental Research Information" consists of preliminary NASA research products and should be interpreted and used accordingly.

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