2007-1-26 Polar Telecon Peter Chi: Travel-time magnetoseismology 1 Travel-time Magnetoseismology Peter J. Chi and C. T. Russell UCLA/IGPP Acknowledgments:

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Presentation transcript:

Polar Telecon Peter Chi: Travel-time magnetoseismology 1 Travel-time Magnetoseismology Peter J. Chi and C. T. Russell UCLA/IGPP Acknowledgments: MHD simulation results are provided by Dong-Hun Lee.

Polar Telecon 2 Peter Chi: Travel-time magnetoseismology The Scientific Question How do the impulse-induced perturbations propagate in the magnetosphere? How do the impulse-induced perturbations propagate in the magnetosphere? How can such knowledge help us estimate the state of the magnetosphere? How can such knowledge help us estimate the state of the magnetosphere? Earth

Polar Telecon 3 Peter Chi: Travel-time magnetoseismology Three Seismologies, Two Methods SeismologyHelioseismologyMagnetoseismology Travel-time Normal-mode

Polar Telecon 4 Peter Chi: Travel-time magnetoseismology Scale Lengths Associated with Magnetoseismology Can’t use ray tracing in magnetoseismology !!! Scale Comparison Earth & Seismic Waves Magnetosphere & MHD Waves Radius 6400 km ~64,000 km (sunward) Wave speed 1-14km/s ,000 km/s Wave- length ~10 0 km km Scale length of  V Typically  10 3 km Typically  2  10 4 km Dayside impulses Nightside impulses

Polar Telecon 5 Peter Chi: Travel-time magnetoseismology Tamao’s Model of Impulse Propagation via MHD Waves Tamao [1964a] Compressional Mode: Propagates in all directions Suffers geometrical attenuation (~ 1/r) Alfven Mode: Propagates along magnetic field line Wave energy conserved Compressional Alfven “Tamao travel path” : preserves most wave energy Tsutomu Tamao

Polar Telecon 6 Peter Chi: Travel-time magnetoseismology Impulse Travel Time Predicted by Tamao’s Model

Polar Telecon 7 Peter Chi: Travel-time magnetoseismology Simulation of Sudden Impulse Propagation via MHD Waves Alfvén speed (Simulation made by Dong-Hun Lee)  B

Polar Telecon 8 Peter Chi: Travel-time magnetoseismology Currents Associated with the Compression MHD waves Kikuchi and Araki [1979] Tamao [1964b] Field-aligned current Ionospheric Hall current Kikuchi and Araki [1979]; Kikuchi et al. [1996] ?

Polar Telecon 9 Peter Chi: Travel-time magnetoseismology Propagation of Impulse Front (Onset)  Onset will be seen across all latitudes on the ground within ~10 sec (without the need of Earth-ionosphere wave guide)! Subsolar point (Noon meridian) Earth MHD simulation t BB onsetarrival It is argued that the Earth-ionosphere waveguide model is evidenced by the simultaneous onset time seen on the ground across all latitudes.

Polar Telecon 10 Peter Chi: Travel-time magnetoseismology Propagation of Impulse Tamao [1964b] Conventional (static) ViewDynamics View +

Polar Telecon 11 Peter Chi: Travel-time magnetoseismology MHD Simulation on Ionospheric Currents due to Impulse Plasmapause Latitude

Polar Telecon 12 Peter Chi: Travel-time magnetoseismology Tremors (quakes) in space

Polar Telecon 13 Peter Chi: Travel-time magnetoseismology Density Model and Inversion Parameters to solve: (t 0,) n mp, m 1, L pp, n pp, m 2 Density Function Nonlinear optimization (L pp : plamapause L-value) (t 0 : start time) Tamao Model of Wave Propagation a b c d e

Polar Telecon 14 Peter Chi: Travel-time magnetoseismology Density Profile Estimated through Magnetoseismic Inversion In situ observations by Akebono also suggest that the plasmapause Lpp ~ 3.5 prior to the SI event.

Polar Telecon 15 Peter Chi: Travel-time magnetoseismology Polar’s Observation of Impulse Time Estimated Start time: 2344:20 UT Calculated travel time from impact location to Polar: 48.4 sec Observed arrival time at Polar: 2345:08 UT Polar 48.4 sec

Polar Telecon 16 Peter Chi: Travel-time magnetoseismology Nightside Magnetoseismology Tamao’s travel path: 1.From low L to high L 2.From high L to low L

Polar Telecon 17 Peter Chi: Travel-time magnetoseismology Test of Inversion: Using Artificial Data True Value Estimation t 0 [sec]  10.0 LSLSLSLS  0.1 n sh [a.m.u./cm 3 ]  0.09 Tsh [eV]  800 Artificial Data: 10 imaginary observations equally spaced between 6 and 24 in L-value (all outside the plasmasphere) Timing uncertainty: 5 sec Arrival time consistent with Tamao travel time Models: Magnetic Field: T89 Plasma: n = n sh /(1 – exp –L/12 ) T = T sh /(1 – 0.5 exp –L/12 )

Polar Telecon 18 Peter Chi: Travel-time magnetoseismology Polar-THEMIS Joint Observations for Magnetoseismic Studies THEMIS will deploy five satellites near the equatorial plane. Magnetoseismic inversion can take advantage of all satellite observations, but it favors the observations distributed across different regions. Polar can provide joint observations at high latitudes, giving critical timing records for Alfven wave propagation. Polar (Modified from the diagram on the THEMIS web site)