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Title: Joint Ne/O and Fe/O Analysis to Diagnose Large Solar Energetic Particle Events during Solar Cycle 23

Abstract

We have examined 29 large solar energetic particle (SEP) events with the peak proton intensity J {sub pp}(>60 MeV) > 1 pfu during solar cycle 23. The emphasis of our examination is put on a joint analysis of Ne/O and Fe/O data in the energy range (3–40 MeV nucleon{sup −1}) covered by Wind /Low-Energy Matrix Telescope and ACE /Solar Isotope Spectrometer sensors in order to differentiate between the Fe-poor and Fe-rich events that emerged from the coronal mass ejection driven shock acceleration process. An improved ion ratio calculation is carried out by rebinning ion intensity data into the form of equal bin widths in the logarithmic energy scale. Through the analysis we find that the variability of Ne/O and Fe/O ratios can be used to investigate the accelerating shock properties. In particular, the high-energy Ne/O ratio is well correlated with the source plasma temperature of SEPs.

Authors:
;  [1];  [2]
  1. Department of Astronomy, University of Maryland, College Park, MD 20742 (United States)
  2. IAASARS, National Observatory of Athens, GR-15236, Penteli (Greece)
Publication Date:
OSTI Identifier:
22663921
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 835; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; CONCENTRATION RATIO; DIAGNOSIS; ELECTRON TEMPERATURE; EMISSION; HELIOSPHERE; ION TEMPERATURE; IONS; IRON; MASS; MEV RANGE; NEON; OXYGEN; PLASMA; PROTONS; SENSORS; SOLAR CYCLE; SPECTROMETERS; SUN; TELESCOPES

Citation Formats

Tan, Lun C., Shao, Xi, and Malandraki, Olga E., E-mail: ltan@umd.edu. Joint Ne/O and Fe/O Analysis to Diagnose Large Solar Energetic Particle Events during Solar Cycle 23. United States: N. p., 2017. Web. doi:10.3847/1538-4357/835/2/192.
Tan, Lun C., Shao, Xi, & Malandraki, Olga E., E-mail: ltan@umd.edu. Joint Ne/O and Fe/O Analysis to Diagnose Large Solar Energetic Particle Events during Solar Cycle 23. United States. doi:10.3847/1538-4357/835/2/192.
Tan, Lun C., Shao, Xi, and Malandraki, Olga E., E-mail: ltan@umd.edu. Wed . "Joint Ne/O and Fe/O Analysis to Diagnose Large Solar Energetic Particle Events during Solar Cycle 23". United States. doi:10.3847/1538-4357/835/2/192.
@article{osti_22663921,
title = {Joint Ne/O and Fe/O Analysis to Diagnose Large Solar Energetic Particle Events during Solar Cycle 23},
author = {Tan, Lun C. and Shao, Xi and Malandraki, Olga E., E-mail: ltan@umd.edu},
abstractNote = {We have examined 29 large solar energetic particle (SEP) events with the peak proton intensity J {sub pp}(>60 MeV) > 1 pfu during solar cycle 23. The emphasis of our examination is put on a joint analysis of Ne/O and Fe/O data in the energy range (3–40 MeV nucleon{sup −1}) covered by Wind /Low-Energy Matrix Telescope and ACE /Solar Isotope Spectrometer sensors in order to differentiate between the Fe-poor and Fe-rich events that emerged from the coronal mass ejection driven shock acceleration process. An improved ion ratio calculation is carried out by rebinning ion intensity data into the form of equal bin widths in the logarithmic energy scale. Through the analysis we find that the variability of Ne/O and Fe/O ratios can be used to investigate the accelerating shock properties. In particular, the high-energy Ne/O ratio is well correlated with the source plasma temperature of SEPs.},
doi = {10.3847/1538-4357/835/2/192},
journal = {Astrophysical Journal},
number = 2,
volume = 835,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}