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Title: On the Link between the Release of Solar Energetic Particles Measured at Widespread Heliolongitudes and the Properties of the Associated Coronal Shocks

Abstract

Under the paradigm that the main agents in the acceleration of solar energetic particles (SEPs) are shocks initially driven by coronal mass ejections, we analyze whether the properties of the shocks in the corona inferred from combining extreme-ultraviolet (EUV) and white-light (WL) observations from multiple vantage points together with magnetohydrodynamic (MHD) simulations of the corona can be used to determine the release of SEPs into different regions of the heliosphere and hence determine the longitudinal extent of the SEP events. We analyze the SEP events observed on 2011 November 3, 2013 April 11, and 2014 February 25 over a wide range of heliolongitudes. MHD simulations provide the characteristics of the background medium where shocks propagate, in particular the Alfvén and sound speed profiles that allow us to determine both the extent of the EUV waves in the low corona and the fast magnetosonic Mach number ( M {sub FM}) of the shocks. The extent of the EUV waves in the low corona is controlled by this background medium and does not coincide with the extent of the SEP events in the heliosphere. Within the uncertainties of (i) the extent and speed of the shock inferred from EUV and WL imagesmore » and (ii) the assumptions made in the MHD models, we follow the evolution of M {sub FM} at the region of the shock magnetically connected to each spacecraft. The estimated release times of the first SEPs measured by each spacecraft does not coincide with the time when the M {sub FM} at this region exceeds a given threshold.« less

Authors:
; ;  [1];  [2]
  1. The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road Laurel, MD 20723 (United States)
  2. Predictive Science, 9990 Mesa Rim Road, Suite 170 San Diego, CA 92121 (United States)
Publication Date:
OSTI Identifier:
22679802
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 847; 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; EMISSION; EXTREME ULTRAVIOLET RADIATION; HELIOSPHERE; MACH NUMBER; MAGNETOHYDRODYNAMICS; MASS; SIMULATION; SOLAR CORONA; SOLAR PARTICLES; SPACE VEHICLES; SUN; VISIBLE RADIATION

Citation Formats

Lario, D., Kwon, R.-Y., Raouafi, N. E., and Riley, P., E-mail: david.lario@jhuapl.edu, E-mail: Nour.Eddine.Raouafi@jhuapl.edu, E-mail: ryunyoung.kwon@gmail.com, E-mail: pete@predsci.com. On the Link between the Release of Solar Energetic Particles Measured at Widespread Heliolongitudes and the Properties of the Associated Coronal Shocks. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA89E3.
Lario, D., Kwon, R.-Y., Raouafi, N. E., & Riley, P., E-mail: david.lario@jhuapl.edu, E-mail: Nour.Eddine.Raouafi@jhuapl.edu, E-mail: ryunyoung.kwon@gmail.com, E-mail: pete@predsci.com. On the Link between the Release of Solar Energetic Particles Measured at Widespread Heliolongitudes and the Properties of the Associated Coronal Shocks. United States. doi:10.3847/1538-4357/AA89E3.
Lario, D., Kwon, R.-Y., Raouafi, N. E., and Riley, P., E-mail: david.lario@jhuapl.edu, E-mail: Nour.Eddine.Raouafi@jhuapl.edu, E-mail: ryunyoung.kwon@gmail.com, E-mail: pete@predsci.com. Sun . "On the Link between the Release of Solar Energetic Particles Measured at Widespread Heliolongitudes and the Properties of the Associated Coronal Shocks". United States. doi:10.3847/1538-4357/AA89E3.
@article{osti_22679802,
title = {On the Link between the Release of Solar Energetic Particles Measured at Widespread Heliolongitudes and the Properties of the Associated Coronal Shocks},
author = {Lario, D. and Kwon, R.-Y. and Raouafi, N. E. and Riley, P., E-mail: david.lario@jhuapl.edu, E-mail: Nour.Eddine.Raouafi@jhuapl.edu, E-mail: ryunyoung.kwon@gmail.com, E-mail: pete@predsci.com},
abstractNote = {Under the paradigm that the main agents in the acceleration of solar energetic particles (SEPs) are shocks initially driven by coronal mass ejections, we analyze whether the properties of the shocks in the corona inferred from combining extreme-ultraviolet (EUV) and white-light (WL) observations from multiple vantage points together with magnetohydrodynamic (MHD) simulations of the corona can be used to determine the release of SEPs into different regions of the heliosphere and hence determine the longitudinal extent of the SEP events. We analyze the SEP events observed on 2011 November 3, 2013 April 11, and 2014 February 25 over a wide range of heliolongitudes. MHD simulations provide the characteristics of the background medium where shocks propagate, in particular the Alfvén and sound speed profiles that allow us to determine both the extent of the EUV waves in the low corona and the fast magnetosonic Mach number ( M {sub FM}) of the shocks. The extent of the EUV waves in the low corona is controlled by this background medium and does not coincide with the extent of the SEP events in the heliosphere. Within the uncertainties of (i) the extent and speed of the shock inferred from EUV and WL images and (ii) the assumptions made in the MHD models, we follow the evolution of M {sub FM} at the region of the shock magnetically connected to each spacecraft. The estimated release times of the first SEPs measured by each spacecraft does not coincide with the time when the M {sub FM} at this region exceeds a given threshold.},
doi = {10.3847/1538-4357/AA89E3},
journal = {Astrophysical Journal},
number = 2,
volume = 847,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}