On the Possible Mechanisms of Two Ground-level Enhancement Events

Details On the Possible Mechanisms of Two Ground-level Enhancement Events On the Possible Mechanisms of Two Ground-level Enhancement Events

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...743..190f&link_type=abstract

The Astrophysical Journal, Volume 743, Issue 2, article id. 190 (2011).

Astronomy and Astrophysics

Astronomy

Solar-Terrestrial Relations, Sun: X-Rays, Gamma Rays

Scientific paper

We have carried out a case study on the possible mechanism of ground-level enhancement (GLE) occurrence. For this, we have considered two GLE events (GLE69 and GLE70) and scrutinized their relationships with simultaneous soft/hard X-rays as well as solar energetic particle (SEP) fluxes of different energy bands. Although most of the energy bands of the flares maintain strong correlations (r >= 0.8) with the GLEs, depending only on this evidence we could not precisely imply that GLEs can be caused by solar flares. So, we have attempted to understand possible relativistic energies of the GLEs, which have been determined by availing the relativistic traversing time and velocities of the particles along the nominal path of Archimedean spiral magnetic field lines. Results suggest that the energy released from accelerated particles in high-energy (γ-ray) solar flares might sometimes cause the GLE. We found that during hard X-ray flares <=7 MeV, the relativistic energy (<=0.23 GeV) of GLE69 was much less than 1 GeV whereas during SEP flares >30 MeV the possible relativistic energy of GLE69 amounts to ~2.78 GeV, and this makes us believe that GLE69 might be caused by the energy released from particle accelerations in high-energy solar flares. On the contrary, during hard X-ray (<=7 MeV) as well as γ-ray solar flares (>30 MeV) the relativistic energy of GLE70 amounts to <=~0.35 GeV, indicating that the GLE70 was presumably not caused by the released energy from accelerated particles in the solar flare. Alternatively, the released energy from particle accelerations in solar radio emission type II burst concomitant coronal-mass-ejection-driven shocks seems to have been responsible for causing the GLE70.

Affiliated with

Also associated with

No associations

Rating

On the Possible Mechanisms of Two Ground-level Enhancement Events 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 On the Possible Mechanisms of Two Ground-level Enhancement Events, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the Possible Mechanisms of Two Ground-level Enhancement Events will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1892227