National Aeronautics and Space Administration

Living With A Star

Targeted Research and Technology

Seismic Forecasting of Solar Activity

ROSES ID: NRA-00-OSS-01      Selection Year: 2001      

Program Element: Independent Investigation: LWS

Principal Investigator: Douglas C. Braun

Affiliation(s): NorthWest Research Associates, Inc.

Summary:

We propose to use standard techniques in phase-coherent seismic imaging to develop the capability for real-time monitoring of the deep solar interior and far side for space-weather forecasting applications. The advent of far-side solar imaging now opens the way for a quick, comprehensive and inexpensive synoptic monitor of large active regions anywhere on the solar surface. We will develop a flexible, portable software package for this utility. In the first year of the project we will implement a working demonstration of our ability topredict the appearance of large active regions from behind the solar limb up to a week in advance, using available SOHO-MDI observations. The ability to predict the emergence of solar activity from directly beneath the solar surface will also have immediate applications to space-weather forecasting. We will conduct a careful study to assess subsurface seismic Doppler and wave-speed perturbations as possible precursors to near-side active-region emergence. We will also extend our near-surface investigation to low spherical-harmonic degrees to probe for signatures of prospective surface activity deep in the convection zone. Finally, we will explore both forward and inverse holographicmodels in terms of subsurface sound-speed and Doppler variations that would give rise to the observed signatures.

Publications:

Performance YearReferenceInvestigation TypeActions
1Braun, D. C.; Lindsey, C.; (2001), Seismic Imaging of t...
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Presentations:

Performance YearReferenceActions
1Braun, D. C.; Lindsey, C.; (2001), Seismic Holography o...
1Lindsey, C.; Braun, D. C.; (2001), Prospects for Heliose...
1Braun, D. C.; Lindsey, C.; (2002), Seismic forecasting...

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