SC-ACIR Event1 March 2013

CME Event17 March 2013 SC-A SC-B

Enhancement of Inner Zone Electron Fluxes

Both eventscaused electron enhancements for <200 keV

What is the mechanism?Will CIRs alwayshave such penetration?

These are background corrected

No electrons >800 keV !

Enhancement of Slot Region Electron Fluxes

CIR Event1 March 2013

CME Event17 March 2013

Electrons enhanced at all L* for ≤300 keV and enhanced at higher L* for >300 keV

No electrons > 1 MeV !

Electrons enhanced for <200 keV at lowest L* and up to 400 keV at higher L*

Will Use CIR Observations From CY24 Declining Phase to Characterize Low L* Differences Between CIR and CME Responses

• We have observed CME related enhancements of electrons in the slot region and deep in the inner zone in multiple events previously

• We have an observation of such enhancements by a CIR• Are such enhancements common for CIRs? • This we can learn as we move towards solar minimum where CIRs

will be the primary driver of radiation belt enhancements– Will we find a fundamental difference between CIR and CME related

electron enhancements at these lower L* regions?– Are these enhancements “injections” or other?