Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· References in the article
· Citations to the Article (9) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
RHESSI Observation of Atmospheric Gamma Rays from Impact of Solar Energetic Particles on 21 April 2002
Authors:
Share, G. H.; Murphy, R. J.; Dennis, B. R.; Schwartz, R. A.; Tolbert, A. K.; Lin, R. P.; Smith, D. M.
Affiliation:
AA(E.O. Hulburt Center for Space Research, Naval Research), AB(E.O. Hulburt Center for Space Research, Naval Research), AC(NASA Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A.), AD(NASA Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A.), AE(NASA Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A.), AF(Space Sciences Laboratory and Dep't. of Physics, University of California,), AG(Space Sciences Laboratory and Dep't. of Physics, University of California,)
Publication:
Solar Physics, v. 210, Issue 1, p. 357-372 (2002). (SoPh Homepage)
Publication Date:
11/2002
Origin:
KLUWER; SPRINGER
Abstract Copyright:
(c) 2002: Kluwer Academic Publishers
DOI:
10.1023/A:1022457507830
Bibliographic Code:
2002SoPh..210..357S

Abstract

The RHESSI high-resolution spectrometer detected γ-ray lines and continuum emitted by the Earth's atmosphere during impact of solar energetic particles in the south polar region from 16:00–17:00 UT on 21 April 2002. The particle intensity at the time of the observation was a factor of 10–100 weaker than previous events when gamma-rays were detected by other instruments. This is the first high-resolution observation of atmospheric gamma-ray lines produced by solar energetic particles. De-excitation lines were resolved that, in part, come from 14N at 728, 1635, 2313, 3890, and 5106 keV, and the 12C spallation product at ˜ 4439 keV. Other unresolved lines were also detected. We provide best-fit line energies and widths and compare these with moderate resolution measurements by SMM of lines from an SEP event and with high-resolution measurements made by HEAO 3 of lines excited by cosmic rays. We use line ratios to estimate the spectrum of solar energetic particles that impacted the atmosphere. The 21 April spectrum was significantly harder than that measured by SMM during the 20 October 1989 shock event; it is comparable to that measured by Yohkoh on 15 July 2000. This is consistent with measurements of 10–50 MeV protons made in space at the time of the γ-ray observations.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints
    


SAO/NASA ADS Homepage | ADS Sitemap | Query Form | Basic Search | Preferences | HELP | FAQ