Case studies of coordinated THEMIS-SuperDARN observations of field line resonances Elsayed R. Talaat The Johns Hopkins University Applied Physics Laboratory.

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Case studies of coordinated THEMIS-SuperDARN observations of field line resonances Elsayed R. Talaat The Johns Hopkins University Applied Physics Laboratory Theodoros Sarris University of Colorado, LASP

Outline Characterization of ULF Waves by Themis and SuperDARN Case study September 5, 2008 –Solar wind pressure pulse Case study February 6-7, 2008 –Strong event across many local times –No obvious excitation mechanism –Eclipse

Themis Measurements E- and B-field measurements during an outbound pass of the five THEMIS probes on 4 September 2007 from 04:00 to 10:00 UT. Er and Eφ in the XY plane in GSE are plotted with a 3 s resolution. The computed frequencies of the standing shear Alfvén waves are plotted over the DPS of the E- and B- field measurements in the color panels as white lines, representing the fundamental poloidal mode (lower line) and its first harmonic (upper line), and as black lines, representing the toroidal mode (lower line) and first harmonic (upper line). The E- and B- fields are orthogonal, indicating the appearance of standing wave field line resonances.

ULF wave field properties for different modes

Wave detection dependent on scatter

Measurements from THEMIS ‐ D on 5 September 2008: radial component of the electric field, Er; azimuthal component of the electric field, Eφ; and radial, azimuthal and field ‐ aligned components of the magnetic field, Br, Bφ and Bz, and their corresponding Dynamic Power Spectra. Field Line Resonance Observations September 5, 2008

SuperDARN observations of FLR

Measurements from THEMIS ‐ D on 6 February 2008: radial component of the electric field, Er; azimuthal component of the electric field, Eφ; and radial, azimuthal and field ‐ aligned components of the magnetic field, Br, Bφ and Bz, and their corresponding Dynamic Power Spectra. Field Line Resonance Observations February 6, 2008

Measurements from THEMIS ‐ D on 6 February 2008: radial component of the electric field, Er; azimuthal component of the electric field, Eφ; and radial, azimuthal and field ‐ aligned components of the magnetic field, Br, Bφ and Bz, and their corresponding Dynamic Power Spectra. Field Line Resonance Observations February 6, 2008

Measurements from GEOS-12 on 6 February 2008: radial, azimuthal and field ‐ aligned components of the magnetic field, Br, Bφ and Bz, and their corresponding Dynamic Power Spectra. Field Line Resonance Observations February 6, 2008

Hankasalmi - February 6, 2008

SuperDARN/Themis Coverage

Measurements from THEMIS ‐ A on 7 February 2008: radial component of the electric field, Er; azimuthal component of the electric field, Eφ; and radial, azimuthal and field ‐ aligned components of the magnetic field, Br, Bφ and Bz, and their corresponding Dynamic Power Spectra. Field Line Resonance Observations February 7, 2008

Measurements from THEMIS ‐ D on 7 February 2008: radial component of the electric field, Er; azimuthal component of the electric field, Eφ; and radial, azimuthal and field ‐ aligned components of the magnetic field, Br, Bφ and Bz, and their corresponding Dynamic Power Spectra. Field Line Resonance Observations February 7, 2008

Hankasalmi – February 7, 2008

Interesting Aside The FLR mechanism can be disturbed by a change in particle density/distribution along the actual field line.

Summary Characterization of ULF Waves by Themis and SuperDARN Case study September 5, 2008 –Solar wind pressure pulse intensification of toroidal FLR Case study February 6-7, 2008 –Strong event across many local times –No obvious excitation mechanism of poloidal FLR –Eclipse

ULF waves observed from ground Continuous pulsations Irregular (Impulsive) pulsations Pc 1Pc 2Pc 3Pc 4Pc 5Pi 1Pi 2 T (sec) f Hz Hz mHz 7-22 mHz 2-7 mHz Hz2-25 mHz

Themis-SuperDARN Coincidences

the field line. Computed frequencies of the standing shear Alfvén waves are plotted over the electric and magnetic field. Polarization of the two modes as a function of distance along the field line.