The Upgraded and Expanded CARISMA Magnetometer Array: New Pi1 Substorm

Science Capabilities

I.J. Rae, Ian R. Mann (PI), K. Murphy, David K. Milling (PM), Andy Kale, Z.C.

Kale, D. Wallis

CARISMA Team,Dept. of Physics, Univ. of Alberta.

www.carisma.ca

Substorm Science: Pi1 Timing at Substorm Onset

CARISMA(www.carisma.ca)

The IMAGE-FUV auroral onset identified by Frey et al. [2004] at 05:44:23 UT in the southern

hemisphere, mapped onto CGM coordinates. Over-plotted are the ULF onset contours (mapped into the southern hemisphere) which show the expansion of ULF power away from the GILL magnetometer. The ULF substorm onset is determined to be 05:40:48 UT (± 16s) [Murphy et al. (2008), submitted]

7th March 2007: Pi1/2 Onset

Simultaneous magnetic onset on the ground at SNKQ and at geosynchronous with GOES 12– Linking the equatorial magnetosphere to the ionosphere within technique

resolution Observations ~1MLT sector apart observe signatures delayed by two minutes Clear, coherent propagation away from localised epicentre close to SNKQ Downward FAC element subsequently forms in SNKQ meridian

Rae et al. (2008b), submitted

ASI and Differenced ImagesFalse colour real and 3s differenced images ~30s apart

Beads prior to auroral break-up seen previously (e.g., Donovan et al., 2005; Liang et al., 2008)

Pi1 onset occurs first at SNKQ

Auroral beads occur first near SNKQ

5th March 2008

Optical Onset ~06:03:45 Magnetic onset 06:04:20

+/- 16s Not quite co-incident

5th March 2008

5th March 2008: Pi1/2 ULF wave power

Co-location of Pi1 & undulations

Onset location within ~20s and station resolution

Compound Substorm Event II

Multiple brightenings prior to break-up

Ability to resolve ULF wave intensifications within compound events – at times!

Rae et al. (2008a), accepted

Data Availability

1sample/s fluxgate standard data product (from 1st April 2005) available from:www.cssdp.ca

Induction coil and 8 samples/s fluxgate data product availabke on request from PI (imann@phys.ualberta.ca)

New Pc1 and Pc5 summary spectra plots products in development.

New Pi2 timing alogorithm and Pi2 onset archive in development.

Array information from www.carisma.ca New AuroraWatch email alert service using

CARISMA data launched at www.aurorawatch.ca