LWS TR&T Emerging Active Regions A Study of Seismic Signatures of Active Regions in Far Side Imaging for Applications to Space Weather LWS TR&T Emerging.

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Presentation transcript:

LWS TR&T Emerging Active Regions A Study of Seismic Signatures of Active Regions in Far Side Imaging for Applications to Space Weather LWS TR&T Emerging Active Regions

A Study of Seismic Signatures of Active Regions in Far Side Imaging for Applications to Space Weather “ The main objective is to develop a quantitative relationship between the far side phase- difference signal and more direct measures of the strength of an active region, such as magnetic field strength, area, and helicity. The expected result is significant improvement of the utility of far side imaging for space weather predictions and the NASA LWS program.” 1. - Statistical study of the relationship between the holographic seismic signatures of active regions and their magnetic and intensity configuration - Far side calibration - Near side calibration 2. - Application of holographic diagnostics, both near side and far side, to simulations of active regions which will be produced by a closely related program.

Prediction capability Carrington Longitude sin(latitude) Active Region NOAA Aug 29 -> Sep AR10808 Active Region NOAA Oct 31 -> Nov AR10923 sin(latitude)

Calibrating the far-side signal

“far-side” imaging of the near side 1 x 3 skip method actually extends well onto the near side! can fill in some of this area with 1 x 4 skip method (in progress…)

“far-side” imaging of the near side

Calibration of the near-side signal Braun & Lindsey, 2000

Calibration of the farside signal 2x2 Skips 1x3 Skips

Calibration of the farside signal Phase Correction: Averaged Phase

Calibration of the farside signal Can we improve the Green’s Functions?

Improving the far side monitor  Success Rate Persistent, strong signal close to the East limb Compare to front side magnetograms 1-2 days later Give a probability number associated to an active region candidate  Adding the magnetic calibration

Conclusions and future work Calibration Calibration Front side “farside” maps Front side “farside” maps How does the overlap of pupils affects the signal? How does the overlap of pupils affects the signal? Revisit the Green’s functions Revisit the Green’s functions Can we improve by using separated rays/frequency ranges? Can we improve by using separated rays/frequency ranges? Ghost signature / near side artifact? Ghost signature / near side artifact? Application to artificial data Application to artificial data Success Rate --> work in progress Success Rate --> work in progress Do we see “emerging active regions” in front side maps? Do we see “emerging active regions” in front side maps? Rings pipeline able to process a set of data centered in an Active Region Rings pipeline able to process a set of data centered in an Active Region Catalog of Emerging Active regions Catalog of Emerging Active regions