Halo CME detection alert from the SIDC/RWC Belgium

CME detection alert automatically produced by CACTUS
Source SIDC (RWC Belgium)
Frequency ASAP, when CME has been reliably detected
Format Plain text
Mail header Halo CME detection alert from the SIDC/RWC Belgium
SIDC code cactus

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Latest issue

:Issued: 2025 Nov 15 0149 UTC
:Product: documentation at http://www.sidc.be/products/cactus
#--------------------------------------------------------------------#
# HALO CME ALERTS from the SIDC (RWC-Belgium), generated by CACTUS   #
#--------------------------------------------------------------------#

  A halo or partial-halo CME was detected with the following
characteristics:

            t0      | dt0| pa | da |  v  |  dv | minv| maxv|
2025-11-14T07:48:07.418 | 3.0 | 336 | 190 | 946 | 305 | 400 | 1736 


      t0: onset time, earliest indication of liftoff
     dt0: duration of liftoff (hours)
      pa: principal angle, counterclockwise from North (degrees)
      da: angular width of the CME (degrees),
       v: median velocity (km/s)
      dv: variation (1 sigma) of velocity over the width of the CME
   mindv: lowest velocity detected within the CME
   maxdv: highest velocity detected within the CME
#--------------------------------------------------------------------#
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Details

This message is of the Fast Alert type.
The CACTUS software package scans through the images produced by the SOHO/LASCO coronagraph. When it detects a partial or full halo CME, this warning message is generated.
Check the ISES code book for information on ISES codes.