Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...669..615c&link_type=abstract
The Astrophysical Journal, Volume 669, Issue 1, pp. 615-620.
Astronomy and Astrophysics
Astronomy
6
Interplanetary Medium, Sun: Solar Wind, Sun: Activity, Sun: Particle Emission
Scientific paper
We present ACE/ULEIS and Wind/STEP observations of a new and unusual feature of energetic ions between 0.02 and 3 MeV nucleon-1 associated with impulsive solar flares. In addition to the usual velocity dispersion associated with the transit in the heliospheric magnetic field of energetic particles from a small localized source on the Sun, these events also show intermittent behavior that may be related to the magnetic flux tube structure of the solar wind. These are anomalous bursts of low-energy particles, which we call ``tassels.'' Tassels are enhancements of ions extending to much lower energies than those associated with the main event. In one year of data from 2000 June to 2001 July, we have identified two events with tassels, both of which occur simultaneously with interplanetary coronal mass ejections (ICMEs). The tassels may be a superposition of two events, either gradual and impulsive or two impulsive events. Since the tassels could be interpreted as ions arriving earlier than those with the same energy in the main velocity dispersion, we suggest that the tassels occur when the spacecraft intercepts a flux tube with a relatively shorter path length. The decrease in path length may be caused by a decrease in scattering or a shorter travel distance, since flux tubes may be distorted by the passage of the ICME. These tassel events may allow us to infer some of the structure of the ICME.
Al Dayeh M.
Chollet Eileen
Giacalone Joe
Mazur J. E.
No associations
LandOfFree
A New Phenomenon in Impulsive-Flare-Associated Energetic Particles 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 A New Phenomenon in Impulsive-Flare-Associated Energetic Particles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A New Phenomenon in Impulsive-Flare-Associated Energetic Particles will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1696865