The CARISMA Array of Fluxgate and Induction Coil...
Transcript of The CARISMA Array of Fluxgate and Induction Coil...
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The CARISMA Array of Fluxgate and Induction Coil Magnetometers
David Milling
CARISMA Project Manager [email protected]
Ian Mann
CARISMA PI Canada Research Chair in Space Physics
Department of Physics, University of Alberta
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Outline • The CARISMA magnetometer network: Instrumentation and data
products • CARISMA – RBSP conjunctions • Ground magnetometer-RBSP conjunctions are a powerful tool for
RB science. – Meso-scale characterisation of Pc3-5 ULF waves. – GB detection of EMIC waves – GB determination of plasmapause
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Expanded CARISMA Magnetometer Array
www.carisma.ca
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Data Products • Fluxgate Magnetometers
– 28 sites, XYZ (24 currently operational) – 8 samples/second (available on request) – 1 sample/second standard data product – 2 samples/second CDF rotated into HDZ for THEMIS
• Induction Coil Magnetometers – 8 pairs, HD – 100 samples/second raw data (available on request) – 20 samples/second standard data product
• Data Access – Open data policy – Online access coming very soon at www.carisma.ca – On request to PI, Project Manager or [email protected]
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Example RBSP GB B-field Trace
CARISMA Expansion to Mid-Latitudes
L=6.6
L=3.5
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Meso-Scale Pc3-5 Wave Characterisation
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Phase Propagation of ULF Waves
• Phase
propagation of ULF waves is critical for resonance with MeV electrons.
• Difficult or impossible to measure with RBSP depending on geometric probe separation.
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March 24 1991 Storm
OUL 1989-046
1990-095
CRRES
Thanks to LANL and CDAWeb for LANL and CRRES Data.
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ULF Wave Radial Diffusion
• New set of ULF wave-derived electric and magnetic radial diffusion coefficients (Ozeke et al., JGR, 2012). Statistics based on 20 years of CARISMA data.
• Ozeke et al. D-LL characterised by Vsw and Kp – can be applied to RBSP events and compared to observations. Test of diffusion theory.
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Test D-LL Radial Diffusion Simulation
• Ozeke et al.
(2012) Kp dependent D-LL.
• Flux at fixed E constructed with multiple PSD simulations.
• Fixed outer BC.
• Simple fixed loss timescale 10 days.
Ozeke (UofA Lead): Future implement PADIE loss (with Horne) and variable outer BC.
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Ground-Satellite Conjunction Studies and Diagnosis of EMIC Waves
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EMIC waves: Relation to Plumes? • Role of EMIC waves in MeV electron dynamics at edge of plasmasphere and
plumes?
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Localised EMIC Waves at the Plasmapause
Usanova et al., GRL, 2008.
• Narrow region (< 1 Re) of EMIC waves inside the plasmapause.
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THEMIS FGM EMIC Element
Statistics • 4 s/c THEMIS data 2007-
2011. • Binned by Pdyn and LT
sector • Rises with Pdyn; peaks
noon and afternoon. • Occurrence rate of EMIC
very low but higher in the outer magnetosphere than the inner.
Usanova et al., JGR, Submitted 2012.
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Cluster Plume Crossings 2001-2006
• Darrouzet et al., Ann Geophys. (2008) routinely identified plume crossing by Cluster.
• They used Cluster WHISPER instrument that measures high-frequency electric fields
and derived electron plasma density from electron plasma frequency. • Their statistics includes 993 plume crossings between 2001-
2006.
Electron density along Cluster trajectories
Schematic showing the plume
EMIC waves were observed during 106 (11%) out of 993 plume crossings: 4% inside and outside; 7% inside. Usanova, Darrouzet, Mann and Bortnik, 2012
Event Statistics
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GB Magnetometer Sensing of Plasmapause and Plumes
IMAGE Satellite EUV images from Goldstein et al, 2004.
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Cross-phase and IMAGE RPI plasma
mass density profiles. • Equatorial plane cross-phase densities have been calculated assuming a dipolar field geometry and a r-3 radial density distribution.
• In-situ RPI electron number densities are shown.
• The heavy ion population may be inferred from the difference between the two profiles.
Dent et al., JGR, 2006.
Heavy ions
Steeper PP
Eroded PS
Refilled PS
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Summary and Conclusions • CARISMA is well located for RBSP conjunctions • Ground magnetometer-RBSP conjunctions are powerful
tool for RB science. – Meso-scale characterisation of Pc3-5 waves. – GB detection of EMIC waves – GB determination of plasmapause – Potential detection of heavy ions (eg with spacecraft potential
from EFW) – Others... (including ionospheric Alfven resonator)
• Welcome collaborative studies with RBSP (and other
platforms)
• Data freely available from www.carisma.ca or on request
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Statistical Analysis of EMIC Waves in Plasmaspheric Plumes from
Cluster Observations M. E. Usanova1, F. Darrouzet2, I. R. Mann1, J. Bortnik3
1University of Alberta, Canada
2Belgian Institute for Space Aeronomy, Belgium 3UCLA, USA
To be submitted to JGR 2012
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EMIC Waves in Plasmaspheric Plumes
Courtesy: Jerry Goldstein
This overlap gives rise to EMIC waves
Plume
The presence of cold dense ions lowers the ion cyclotron instability threshold (Gary et al., 1994). Energetic protons drifting westward from dusk may become unstable when they encounter the enhanced cold plasma densities within the plasmaspheric plume.
Plasmaspheric plume is a portion of the outer plasmasphere on the dayside are transported sunward, during disturbed geomagnetic conditions.
Case studies: Spasojevic et al., GRL 2004; Fuselier et al., JGR 2004; Morley et al., JGR 2009.
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Cluster Plume Crossings from Whisper
• Darrouzet et al., Ann Geophys. (2008) routinely identified plume crossing by Cluster. • They used Cluster WHISPER instrument that measures high-frequency electric fields and derived electron plasma density from electron plasma frequency. • Their statistics includes 993 plume crossings between 2001-2006.
Electron density along Cluster trajectories
Schematic showing the plume
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Event Statistics
38 68 29
858
1
10
100
1000
inside andoutside
inside outside none
4% 7%
3%
86%
EMIC waves were observed during 106 (11%) out of 993 plume crossings: 4% inside and outside; 7% inside.
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Event Statistics: Density and Pdyn vs. L
• The density difference between the events and non-events is insignificant (left panel).
• EMIC events occurred during higher solar wind dynamic pressure than non-events (right panel).
Events Non-events
Events Non-events
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Cluster
Cluster
NOAA
30-80 keV Proton Precipitation
Usanova et al., JGR, 2010.
CARISMA Magnetometer Array
NOAA data courtesy of Finn Soraas.
Ground
Cluster
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Diffusion coefficients derived from CARISMA ULF data mapped along the field lines into the equatorial plane of the outer radiation belt.
Space Weather Now- and Fore-casting with ULF Wave Models