NASA LWS Extreme Space Weather Events II 2014 Workshop

LASP, University of Colorado, BoulderJuly 09-11, 2014

Session 7: Campaign Events

Summary

Speakers:

• Lan Jian• Ying Le• Gang Li• Tibor Torok• Dick Mewaldt

Three Campaign Events:March 1989, July 2000, July 2012

March 1989 July 2000 July 2012

Location N35E69 N22W07 S16W86

Peak flux (pfu) 3500 24000 35800

X-class flare X15 X5 X2.5

Geomagnetic effectiveness (Dst)

-225 -172 -300 to >-1000

July 2000 event

The event exhibited non linear interaction between consecutive CMEs via a magic recipe to form a “perfect storm” extreme event, in which:

An earlier large CME should occur at the right time in order to have a minimal deceleration of the later CMEs. It should occur neither too early nor too late.

Second, the later CMEs should be launched in quick succession. They interact as close to the Sun as possible, so their expansion would be inhibited after the eruptions. The fast transit to 1 AU would significantly reduce the time for them to expand as well.

Liu et al., 2014July 2012 event

July 2012 event

What is the environment that leads to such efficient particle acceleration?

A special magnetic configuration leading to a two-stage eruption within a short period of time (STB, STA, SDO)

2012

July 2000 eventFlux rope eruption modeling