NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Observations and Interpretations of Energetic Neutral Hydrogen Atoms from the December 5, 2006 Solar EventWe 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 gamma-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 > or equal to 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.
Document ID
20100003420
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Mewaldt, R. A. (California Inst. of Tech. Pasadena, CA, United States)
Leske, R. A. (California Inst. of Tech. Pasadena, CA, United States)
Shih, A. Y. (California Univ. Berkeley, CA, United States)
Stone, E. C. (California Inst. of Tech. Pasadena, CA, United States)
Barghouty, A. f. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Cohen, C. M. S. (California Inst. of Tech. Pasadena, CA, United States)
Cummings, A. c. (California Inst. of Tech. Pasadena, CA, United States)
Labrador, A. W. (California Inst. of Tech. Pasadena, CA, United States)
vonRosenvinge, T. T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
June 21, 2009
Subject Category
Solar Physics
Report/Patent Number
M10-0017
Meeting Information
Meeting: SolarWind-12
Location: Paris
Country: France
Start Date: June 21, 2009
End Date: June 26, 2009
Funding Number(s)
CONTRACT_GRANT: NAS5-03131
CONTRACT_GRANT: SA2715-26309
Distribution Limits
Public
Copyright
Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available