Remote sensing of low-energy SEPs via charge exchange
Abstract
Charge-exchange reactions at high energies provide new channels for the remote sensing of solar high-energy particles, as demonstrated by the recent detection of 1.8-5 MeV hydrogen atoms from a solar flare [1]. Orrall and Zirker [2] had earlier proposed the detection of low-energy protons via charge-exchange atomic reactions in the solar atmosphere, leading in the simplest case to extended red-wing emission in the Lyman-alpha line. We discuss the analogous process for the He II 304 A˚ line (for alpha particles) and also assess the feasibility of the analogous process in the solar wind, whereby ambient He and (C, N, O) ions allow low-energy alpha particles to undergo resonant charge exchange in the ambient corona and thereby produce 304 A˚ wing emission close to the acceleration region.
- Publication:
-
Solar Wind 13
- Pub Date:
- June 2013
- DOI:
- 10.1063/1.4810979
- Bibcode:
- 2013AIPC.1539...19H
- Keywords:
-
- chromosphere;
- solar composition;
- solar coronal mass ejections;
- solar flares;
- solar wind;
- 96.60.Fs;
- 96.60.Na;
- 96.60.ph;
- 96.60.qe;
- 96.60.Vg;
- Composition;
- Chromosphere;
- Coronal mass ejection;
- Flares;
- Particle emission solar wind