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July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Coronal Sources of Impulsive Fe-Rich Solar Energetic Particle Events

Jul 30, 2015, 3:30 PM
1h
Theater Foyer (World Forum)

Theater Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 2
Poster contribution SH-EX Poster 1 SH

Speaker

Stephen Kahler (Air Force Research Laboratory)

Description

We review recent work on 111 Fe-rich impulsive solar energetic (~3 MeV/nuc) particle (SEP) events observed from 1994 to 2013. Strong elemental abundance enhancements scale with A/Q, the ion mass-to-charge ratio, as (A/Q)^(a), where 2 < a < 8 for different events. Most Fe-rich events are associated with both flares and coronal mass ejections (CMEs), and those with larger a are associated with smaller flares, slower and narrower CMEs, and lower SEP event fluences. The narrow equilibrium temperature range required to fit the observed A/Q enhancements is 2.5--3.2 MK, far below the characteristic flare temperatures of > 10 MK. Only a small number of SEP events slightly outside this temperature range were found in an expanded search of impulsive Fe-rich events. Event characteristics are similar for events isolated in time and those occurring in clusters. The current challenge is to determine the solar sources of the Fe-rich events. Ambient coronal regions in the 2.5--3.2 MK range are broadly distributed both in and outside active regions. We explore the possibility of acceleration from thermal plasmas at reconnecting current sheets in the context of observed standard and blowout jets. Recent current sheet reconnection modelling provides a basis for the A/Q enhancements
Registration number following "ICRC2015-I/" 22

Primary author

Stephen Kahler (Air Force Research Laboratory)

Co-authors

Don Reames (University of Maryland) Edward Cliver (National Solar Observatory)

Presentation materials