Abstract
In DOK-2 experiments onboard Interball 1,2 (Lutsenko at al., 1998) we observed ∼200 dispersion structures in energetic ion and electron spectra in the auroral zones of the Earth's magnetosphere at ILAT=67–74° (L=6.5–13.2). Some detailed analysis results for ∼40 of these dispersion events are given. Their main characteristics show that we have deal with particles, which were injected momentary onto closed magnetic field lines from the plasma sheet and experienced a gradient-curvature drift. In some cases we observed ions from one injection making several turns around the Earth, which allowed us to find accurate values of drift periods in the real magnetic field. Due to high energy and time resolutions of DOK-2 the dispersion structure analysis may give a drift start time To with an accuracy of tens of seconds and an estimation of the acceleration process duration which was ∼1 min. The time To was compared with the time history of UVI brightening in the auroral oval. The comparison can help to determine the moment of a large-scale particle acceleration in the chain of events accompanying substorm development. For several substorms source energetic particle spectra were reconstructed from our dispersion event data.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
