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Impacts On Proton Fluxes Observed During Different Interplanetary Conditions View all abstracts by submitter

Binod Adhikari   Submitted: 2019-04-16 08:28

Interplanetary coronal mass ejections (ICMEs) and Corotating Interaction Regions (CIRs) are the major characteristic events of the solar wind. We utilized the proton flux data of different energy level measured by the Low Energy Magnetic Spectrometers (LEMS) 120 system of the Electron, Proton and Alpha Monitor (EPAM) for studying different ICME-driven and CIR-driven storms. Our main aim was to find out from the observational results the nature of proton flux during solar storms driven by different forces, in our cases, ICMEs and CIRs, in the interplanetary regions. We analysed the different parameters provided by the LEMS 120 system and compared them during the different storm types and during the quietest day as well. We studied four events: a geomagnetically quiet day, two ICME-driven storms and one CIR-driven storm. We also analysed the IMF magnitude (Bmag) and the different parameters of the solar wind during all these events. We observed that the prolonged particle precipitations during CIRs and the intense particle precipitations during ICMEs result in the different nature of the proton flux of different energy level in comparison to other parameters such as Bmag, and solar wind velocity (Vsw). Our results show that there is strong correlation between the higher energy proton fluxes and Bmag-Vsw during the quiet period and weak correlation in the case of lower energy protons during the quiet event. But, when the storm is either driven by ICMEs or CIRs, the lower energy also starts to show positive correlations with Bmag and Vsw with a 0 min time lag during ICMEs and a ~-100 min time lag during CIRs. During the quiet day, the proton flux observed was due to the perturbations created by ionization and the higher energy of the protons sufficiently weakened. Whereas, CMEs speed, preceding CMEs, and the presence of pre-existing Solar Energetic Particles (SEPs) in the ambient medium, the makeup of CIRs wind, and the nature of precipitation during both ICMEs and CIRs caused the fluxes of protons of different energy level during storm times.

Authors: Binod Adhikari,Niraj Adhikari, Binil Aryal, Narayan P. Chapagain, and Ildiko Horvath
Projects: None

Publication Status: Accepted on Solar physics
Last Modified: 2019-04-16 17:19
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