SuperDARN Workshop, 2011 Upstream Pc3 ULF wave signatures observed near the Earth's cusp Tim Yeoman Darren Wright (Leicester) Mark Engebretson, Fei Lu,

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SuperDARN is a network of HF radars (8-20 MHz) used to study the convection in the Earth's ionosphere at altitudes between 90 and 400 km and at magnetic.

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Presentation transcript:

SuperDARN Workshop, 2011 Upstream Pc3 ULF wave signatures observed near the Earth's cusp Tim Yeoman Darren Wright (Leicester) Mark Engebretson, Fei Lu, and Jennifer Posch (Augsburg, USA); Marc Lessard and Hyomin Kim (University of New Hampshire, USA) SuperDARN Workshop, 2011

Gary, 1981Takahashi, 1984

SuperDARN Workshop, 2011 Howard and Menk, 2005 Engebretson et al., 2005

SuperDARN Workshop, 2011 The Augsburg induction magnetometer array and the Hankasalmi radar

SuperDARN Workshop, 2011 Intervals were selected with strong Pc3 activity, where the upstream ACE cone angle is conducive to upstream wave generation, and good cusp data coverage is available from Hankasalmi, with high time resolution data on Channel B beam 9 21 Feb 2008

SuperDARN Workshop, Hz sampled induction coil data FFT length 20 min, 5 min slip NAL LYR HOR Hankasalmi Channel B data: Beam 9, 3 s sampling

SuperDARN Workshop, 2011 Identify the cusp: Width >200 m s -1 5 min average Sum wave power between 20 and 40 mHz

SuperDARN Workshop, 2011 LYR largest at the beginning and end, when the cusp is at highest latitudes, HOR largest when cusp is at lowest latitudes Peak power ~ 3 - 4° equatorward of cusp

SuperDARN Workshop, 2011 LYR largest at the beginning. HOR largest when cusp moves lower both when HOR is poleward and equatorward of the cusp Peak power ~ 2° equatorward of cusp Combine together 14 days with good Pc3 activity: 1364 data points for comparison

SuperDARN Workshop, 2011

Upsteam wave power will very with time: normalise with power at Halley, well equatorward of the cusp

SuperDARN Workshop, 2011

The CUTLASS Hankasalmi radar is an excellent diagnostic of the cusp location for use with the Augsburg magnetometer array on Svalbard Pc3 ULF wave activity peaks ~2° equatorward of the cusp, rather than in the cusp itself. Pc3 ULF wave activity can be seen to be modulated as the open- closed field line boundary, as predicted from the Hankasalmi radar data, migrates across the magnetometer array Wave power occupies a fairly broad latitude range equatorward of the open-closed field line boundary, but drops sharply poleward of it. The spatial structure of the wave power within the magnetosphere seems to be as important as its temporal variability. Howard and Menk (2005) seem to have a point. Conclusions

SuperDARN Workshop, 2011