Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.1408s&link_type=abstract
American Astronomical Society, SPD meeting #34, #14.08; Bulletin of the American Astronomical Society, Vol. 35, p.830
Astronomy and Astrophysics
Astronomy
Scientific paper
RHESSI has observed the positron-electron annihilation line at 511 keV produced during the 2002 July 23 solar flare. The shape of the line is consistent with annihilation in two vastly different solar environments. It can be produced by formation of positronium by charge exchange in flight with hydrogen in a quiet solar atmosphere at a temperature of ˜ 6000 K. However, the measured upper limit to the 3γ /2γ ratio (ratio of annihilation photons in the positronium continuum to the number in the line) is only marginally consistent with what is calculated for this environment. The annihilation line can also be fit by a thermal Gaussian having a width of 8.1 +/- 1.1 keV (FWHM), indicating temperatures of ˜ 4 - 7 x 105 K. The measured 3γ /2γ ratio does not constrain the density when the annihilation takes place in such an ionized medium, however the density must be high enough to slow down the positrons. This would require the formation of a substantial mass of atmosphere at transition-region temperatures during flares.
Hudson Hugh S.
Kozlovsky Benz
Lin Robert P.
Murphy Ronald J.
Schwartz Richard A.
No associations
LandOfFree
High-Resolution Observation of the Solar Positron-Electron Annihilation Line does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High-Resolution Observation of the Solar Positron-Electron Annihilation Line, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-Resolution Observation of the Solar Positron-Electron Annihilation Line will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-987258