An Analysis of a False Delay in the Acceleration of SEPs Associated with Halo CMEs


  • Habeeb Allawi, A.Al-Sawad


In this paper, we investigate and analyze five solar eruptions by using the Coronal Mass Ejection
CME catalog of the Large Angle, Spectrometric Coronagraph (LASCO)/SOHO to identify properties of
the five of halo coronal mass ejections accompanied by high intensity of proton events. and the
Geostationary Operational Environmental Satellites (GOES), where the data has been collected for solar
flares with soft X-rays. The Energetic and Relativistic Nuclei and Electron (ERNE) experiment observed
solar energy particles. WAVES onboard WIND spacecraft give data for associating Decametric–
Hectometric (DH) type II for the events taking place, the databases available in the data center of Wind
and STEREO for metric (m) type II bursts have been utilized. This study has found that two delayed events
out of the 5 events having location over 5 R? of halo CMEs and injection time of SEPs during their starting
of acceleration and injection times of SEPs. The delay in the events is understood to be due to the
instrumental effect rather than being caused by a spatial or temporal effect. furthermore, the other reason
for the delay is because of the background effect due to multi-source mechanisms before the first protons
injections in the events.