Isotopic Composition of Solar Energetic Particle Events Measured by Advanced Composition Explorer/ULEIS

Details Isotopic Composition of Solar Energetic Particle Events Measured by Advanced Composition Explorer/ULEIS Isotopic Composition of Solar Energetic Particle Events Measured by Advanced Composition Explorer/ULEIS

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...563..403d&link_type=abstract

The Astrophysical Journal, Volume 563, Issue 1, pp. 403-409.

Astronomy and Astrophysics

Astronomy

13

Acceleration Of Particles, Ism: Cosmic Rays, Interplanetary Medium, Sun: Solar Wind, Sun: Flares, Sun: Particle Emission

Scientific paper

Since its 1997 August launch, the Ultra Low Energy Isotope Spectrometer (ULEIS) on board the Advanced Composition Explorer (ACE) has observed a large number of solar energetic particle (SEP) events in the 0.4-3 MeV nucleon-1 range. These events show remarkable variability of both the elemental and isotopic compositions, with 22Ne/20Ne varying, from event to event, by up to a factor of 10, Fe/O by up to a factor of 100, and 3He/4He by up to a factor of 104. In this paper we present new measurements of the 22Ne/20Ne, 26Mg/24Mg, and 3He/4He ratios at ~1 MeV nucleon-1 and compare these ratios to the iron abundances measured during the same time periods. We find that the elemental abundances, Fe/O and Fe/Mg, and the isotopic abundances, 22Ne/20Ne and 26Mg/24Mg, are all well ordered by both the 3He/4He ratio and the average Fe charge state as measured by ACE/SEPICA. These variations in 22Ne/20Ne and 26Mg/24Mg are much larger than expected from the charge to mass dependence derived for the elemental abundances, and we suggest that the large fluctuations seen for the neon and magnesium isotopes are related to the amount of impulsive flare material present.

Affiliated with

Also associated with

No associations

Rating

Isotopic Composition of Solar Energetic Particle Events Measured by Advanced Composition Explorer/ULEIS 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 Isotopic Composition of Solar Energetic Particle Events Measured by Advanced Composition Explorer/ULEIS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isotopic Composition of Solar Energetic Particle Events Measured by Advanced Composition Explorer/ULEIS will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1387903