SOHO/LASCO Halo CME  20251021
COMMENTS:  Full HALO CME — BACKSIDE
                          LASCO velocity: 1301.2 km/sec  Acceleration: -84.89 m/sec^2
                         

Halo Alert: halo-message.20251021



UCMEO 93001 51021 1855/
51021 62024 82124 3152/ 315// 333// 41301
51021 62004 82044 ///// ///// /////
99999

PLAIN  


SOHO/LASCO  HALO CME October 21, 2025

C2 Start Time:  20:24 UT

C3 Start Time:  20:30 - 23:06 UT

Type of CME:
Full HALO CME — BACKSIDE
pa1:  315    pa2:  315      Total Width:  360 degrees

Velocity Measurements:

C2:   3 points    1511.3 km/sec @ PA 315
C3:   8 points  1242.2 km/sec @ PA 315
Average through both(C2/C3) fields:  1301.2 km/sec  Acceleration: -84.89 m/sec^2

COMMENT:  C2/C3 shows an asymmetric full HALO @ 20:24 UT near the Western hemisphere. GOES-19 SUVI Composite 195 Angstroms shows opening lines near the Northwestern hemisphere starting @ 20:04 UT with an event occurring near the Western limb on the backside. In addition, SolarSoft reports a shock propagation in the Northwestern limb as seen in GOES-19 SUVI 195 Angstroms.


Preliminary UCMEO velocity and position measurements are delivered first.
Images, movies, and time/height information for this event will be available at:

https://umbra.nascom.nasa.gov/lasco/observations/halo/2025/251021/



Best Regards,

--Taylor Lanier

BT
[Images from original message are omitted here]

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SOHO/LASCO C2 Diff
 SOHO/LASCO C2
 STEREO/COR2 BEHIND
20251021_211207_c2rdiff.gif
 20251021_2112_c2_1024.jpg
 COR2_behind_NO_DATA.gif
SOHO/LASCO C3 Diff SOHO/LASCO C3 GOES-19 SUVI 195 Angstroms
20251021_225411_c3rdiff.gif
 20251021_2254_c3_1024.jpg  or_suvi-l2-ci195_g19_s20251021T200400Z_e20251021T200800Z_v1-0-2.png
GOES-19 SUVI 195 Angstroms
 STEREO/COR2 AHEAD Diff SDO AIA 195 Angstrom Diff
20251022_022504_20251022_033347.gif
 		COR2_behind_NO_DATA.gif
 		20251021_201200_aia_193_rdiff.gif


SOHO/LASCO C2
20251021_2048_D2_combo.gif
SOHO/LASCO C3
20251021_2206_D3_combo.gif




Time/Height Velocities and Plots

C2/C3
20251021_c2c3_ht.png

Click on Links below for additional information.
     

ENUL Forecast Model(TO DO)

Courtesy of Community Coordianted Modeling Center (CCMC) and the Space Weather Research Center (SWRC)

ENUL-2.7 20251021 Time/Density
20251021_225200_2.0_anim.tim-den.gif


MPEG Movies


Additional Information

LASCO Software IDL Save Files (.mvi)




  • Please, send questions and comments to Kevin Schenk