Multi-spacecraft Observations of Energetic Particle Events from 0.3 to 1.0 AU: Measurements by MESSENGER, STEREO, and ACE

Details Multi-spacecraft Observations of Energetic Particle Events from 0.3 to 1.0 AU: Measurements by MESSENGER, STEREO, and ACE Multi-spacecraft Observations of Energetic Particle Events from 0.3 to 1.0 AU: Measurements by MESSENGER, STEREO, and ACE

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh42b..05h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH42B-05

Astronomy and Astrophysics

Astrophysics

[2111] Interplanetary Physics / Ejecta, Driver Gases, And Magnetic Clouds, [2114] Interplanetary Physics / Energetic Particles, [2139] Interplanetary Physics / Interplanetary Shocks, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles

Scientific paper

From late 2007 until very recently, solar activity had been extremely low. Particle instruments on spacecraft throughout the heliosphere have reported minimal solar particle intensities, whereas the galactic cosmic ray intensities are at their highest levels in 50 years. However, starting on 14 August 2010, a series of solar flares and coronal mass ejections have been observed by multiple in-situ instruments throughout the heliosphere. In a period of less than 5 days, an active region (AR 1099) on the western limb of the Sun produced two solar energetic particle (SEP) events and associated coronal mass ejections (CMEs). During that time, the MESSENGER spacecraft was cruising near its perihelion distance (~0.3 AU) at W110° relative to the Earth-Sun line and the STEREO Ahead spacecraft was at W80°. Together with the ACE spacecraft, the particle instruments on these probes measured the associated SEPs and the plasma and field instrument detected the associated interplanetary CMEs. In this paper, we report the first multi-spacecraft observations of these recent events, and we discuss the propagation and transport of SEPs from 0.3 to 1 AU.

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