12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone

The extent of the chorus observed at Marion Island

14 Jul 2011, 17:00
2h
Asteria

Asteria

Poster Presentation Track D2 - Space Science Poster2

Speaker

Dr Andrew Collier (Hermanus Magnetic Observatory)

Description

On the 4 August 2010, chorus was observed at Marion Island from 03:00 - 07:00 UT (06:00 - 10:00 LT). Marion Island (46.9°S/37.1°E, L = 2.62) is within the plasmasphere during periods of low geomagnetic disturbance, making the observation of chorus there a rare occurrence. On the 4 August, a moderate geomagnetic storm occurred, with a maximum Kp of 6+, and a minumum DST of -70nT. These conditions compressed the plasmasphere to such an extent that Marion Island was near to, or outside, the plasmaspause at the time of the emission, making the observation of chorus possible. On the same day, there chorus was also observed at SANAE IV (L = 4.32). The spectral properties of these chorus are different, meaning that the chorus observed at SANAE IV was generated in a different region to that observed at Marion Island. We present broadband data from both Marion Island and SANAE IV, and extent of the chorus generating region is inferred from DEMETER data.

Level (Hons, MSc, <br> &nbsp; PhD, other)? PhD
Consider for a student <br> &nbsp; award (Yes / No)? No
Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)? Yes

Primary author

Mr Brett Delport (University of KwaZulu-Natal)

Co-authors

Dr Andrew Collier (Hermanus Magnetic Observatory) Dr Mark Clilverd (British Antarctic Survery) Dr Michel Parrot (LPCE/CNRS)

Presentation Materials

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