Emma Spanswick & Eric Donovan SS Injection Region Ionospheric Observations Magnetospheric...

Emma Spanswick & Eric Donovan

SS Injection Region

Ionospheric Observations

Magnetospheric Observations

Physical boundaries

magnetospheric models

Correlation of >30keV e- flux(for example)


Feb 2nd - MSP

Dipolarizations

Feb 2nd - Riometer


The NORSTAR riometers observe three injections – each injection is seen in multiple riometers

They are relatively localized (ie. they do not appear across the array)

Injection #1 - ~7:40UTThe only one I’m goingto show (Emma ran outof time)

Feb 2nd – White Light


What is the optical signature of the injection?

Can we track the injection region with the optics?... Basically can we use the ASIs as a large scale imaging riometer ? (for the purpose of identifying injections)

injection in riometer



What is the optical signature of the injection?

Can we track the injection region with the optics?... Basically can we use the ASIs as a large scale imaging riometer ? (for the purpose of identifying injections)

Using a grid size roughly equivalent to a riometer FOV



follow the temporal evolution of grid cells

and apply the dispersionless injectioncriteria of Spanswick

et. al 2007

The idea…

Grid cells containing more

than 100 ASI pixels



E

WInjections:• <3min rise time• >15 minute dur.



Injection onset



+30s



+1 minute


Mapping out the injection informationwithin the grid cells using T87 – Kp2

One snapshot can be mapped out using any standard empirical model to give a general idea of what one step in this might look like in the magnetotail.

So this is certainly reasonable…


… but this is almost certainly garbage!


SS Injection Region

Ionospheric Observations

Magnetospheric Observations

Physical boundaries

magnetospheric models

Correlation of >30keV e- flux(for example)

riometer

white light ASI

MSI

MSP

GMAGs

SST

ESA

FGM

IC

Feb 2nd – Injection


THEMIS Science Meeting – March 18th 2008

Mapping Questions


We have previously found (with riometers and CRRES) that the correlation between integrated electron flux above 30keV and riometer absorption could be used to infer something about satellite mapping..

What are the right in situ quantities to do this with and what is the right scale size??

Can the combined information from riometers / MSPs / NORSTAR-MSIshelp determine satellite mapping for THEMIS??

Feb 2nd – Injection


More needs to be done….

Where are these injection in the CPS??

Using the THEMIS–ASI , NORSTAR-MSP, NORSTAR– MSI, we can place the onset of injection relative to the proton/electron auroral boundaries (location in CPS)

Meaningfully map the time sequence to the equatorial plane

Correlate transient signatures from THEMIS ESA and the white light and multi-spectral ASIs

Use event-specific empirical model adjusted as best as possible to give a time evolving mapping.

Emma Spanswick & Eric Donovan SS Injection Region Ionospheric Observations Magnetospheric...

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