GRADUAL SOLAR ENERGETIC PARTICLE EVENT ASSOCIATED WITH A DECELERATING SHOCK WAVE

Journal Article · Mon Jul 20 04:00:00 EDT 2009 · Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/700/1/L51; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21313885

Kocharov, L; Laitinen, T; Al-Sawad, A; Saloniemi, O; Valtonen, E ^[1]; Reiner, M J ^[2]

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1. Space Research Laboratory, Department of Physics and Astronomy, University of Turku, Turku 20014 (Finland)
2. Catholic University of America, Washington, DC (United States)

On 2000 April 4-6 the Energetic and Relativistic Nuclei and Electron particle telescope on the Solar and Heliospheric Observatory spacecraft observed a major solar energetic particle (SEP) event associated with two coronal mass ejections (CMEs) separated by approximately 8 hr. The first CME was accompanied by a low-frequency type II radio burst observed by the WAVES receivers on the Wind spacecraft. Analysis of the high-precision measurements of the {approx}20 MeV proton flux anisotropy, model fitting of the type II dynamic spectrum, and SEP transport modeling support the idea that the shock wave of the first CME was an efficient accelerator for {approx}20 MeV protons during only the first 6 hr after the launch. This shock gradually slowed down, weakened, and became transparent for the protons produced by the second eruption behind the previous CME. The main production of SEPs due to the two successive eruptions continued together for 12 hr. The near-Earth SEP event was additionally amplified by the SEP mirroring in the interplanetary magnetic field draping at the edge of an old CME beyond the Earth's orbit, which made the SEP intensity-time profiles more prolonged than would be expected based on the assumption of SEP transport in the standard solar wind.

• OSTI ID: 21313885
• Journal Information: Astrophysical Journal (Online), Journal Name: Astrophysical Journal (Online) Journal Issue: 1 Vol. 700; ISSN 1538-4357
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS
ACCELERATION
ANISOTROPY
ELECTRONS
EMISSION
ERUPTION
INTERPLANETARY MAGNETIC FIELDS
MASS
MEV RANGE 10-100
ORBITS
PROTONS
RELATIVISTIC RANGE
SHOCK WAVES
SIMULATION
SOLAR WIND
SPECTRA
SUN
TELESCOPES