Evaluation of solar energetic Fe charge states: effect of proton-impact ionization

Details Evaluation of solar energetic Fe charge states: effect of proton-impact ionization Evaluation of solar energetic Fe charge states: effect of proton-impact ionization

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...357..716k&link_type=abstract

Astronomy and Astrophysics, v.357, p.716-724 (2000)

Astronomy and Astrophysics

Astrophysics

29

Sun: Corona, Sun: Flares, Sun: Particle Emission, Acceleration Of Particles

Scientific paper

We present the energy-dependent rates of ionization and recombination of energetic Fe ions in solar coronal plasma for the energy range from 0.01 to above 100 MeV nucleon-1. For the > 0.1 MeV n-1 ions, the energy dependencies become essential for both ionization and recombination processes. Ionization of the Fe projectile by ambient protons is important if the Fe energy exceeds typically 0.2-0.9 MeV n-1. The equilibrium distributions established by the balance between ionization and recombination collisions are calculated for the temperature range T=106-107 K. We also present numerical calculations of the time-dependent (nonequilibrium) mean charge state at a given energy of the Fe ion. The results are relevant for the interpretation of charge states of the solar energetic ions. Our calculations support the qualitative conclusion that the observed energy-dependent Fe charge states are a result of concurrent acceleration and charge-changing processes. However, the estimated time scales of the processes are shorter than would be expected based on the energy-independent (thermal) charge-changing rates with no proton impact ionization included. The ~ 30 MeV n-1 Fe charge state observed in the 6-9 November 1997 event and our calculations suggest that the ~ 30 MeV n-1 ions were accelerated mainly near the Sun, at heliocentric distances < 2 R_sun.

Affiliated with

Also associated with

No associations

Rating

Evaluation of solar energetic Fe charge states: effect of proton-impact ionization 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 Evaluation of solar energetic Fe charge states: effect of proton-impact ionization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evaluation of solar energetic Fe charge states: effect of proton-impact ionization will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1121612