Observations and Interpretations of Energetic Neutral Hydrogen Atoms from the December 5, 2006 Solar Event

Details Observations and Interpretations of Energetic Neutral Hydrogen Atoms from the December 5, 2006 Solar Event Observations and Interpretations of Energetic Neutral Hydrogen Atoms from the December 5, 2006 Solar Event

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1216..592m&link_type=abstract

TWELFTH INTERNATIONAL SOLAR WIND CONFERENCE. AIP Conference Proceedings, Volume 1216, pp. 592-595 (2010).

Astronomy and Astrophysics

Astronomy

Solar Corona, Astronomical Telescopes, Hydrogen, Interplanetary Magnetic Fields, Coronal Mass Ejection, Space-Based Ultraviolet, Optical, And Infrared Telescopes, Hi Regions And 21-Cm Lines, Diffuse, Translucent, And High-Velocity Clouds, Interplanetary Magnetic Fields

Scientific paper

We discuss recently reported observations of energetic neutral hydrogen atoms (ENAs) from an X9 solar flare/coronal mass ejection event on 5 December 2006, located at E79. The observations were made by the Low Energy Telescopes (LETs) on STEREO A and B. Prior to the arrival of the main solar energetic particle (SEP) event at Earth, both LETs observed a sudden burst of 1.6 to 15 MeV energetic neutral hydrogen atoms produced by either flare or shock-accelerated protons. RHESSI measurements of the 2.2-MeV γ-ray line provide an estimate of the number of interacting flare-accelerated protons in this event, which leads to an improved estimate of ENA production by flare-accelerated protons. Taking into account ENA losses, we find that the observed ENAs must have been produced in the high corona at heliocentric distances >=2 solar radii. Although there are no CME images from this event, it is shown that CME-shock-accelerated protons can, in principle, produce a time-history consistent with the observations.

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