National Aeronautics and Space Administration

Living With A Star

Targeted Research and Technology

Detection of Emerging Active Regions and Forecast of Their Evolution and Activity by Time-Distance Helioseismology

ROSES ID: NNH06ZDA001N      Selection Year: 2007      

Program Element: Focused Science Topic

Principal Investigator: Philip Scherrer

Affiliation(s): Stanford University

Project Member(s):
Duvall, Thomas L. Co-I NASA/GSFC
Zhao, Junwei Postdoctoral Associate null
Couvidat, Sebastien Paul Postdoctoral Associate Stanford University
Kosovichev, Alexander G Co-I/Science PI New Jersey Institute of Technology
Stein, Robert Collaborator Michigan State University
Georgobiani, Dali Collaborator Michigan State University
Parchevsky, Konstantin Postdoctoral Associate Stanford University


We propose to develop time-distance helioseismology

techniques for the application of detecting emerging active

regions before they become visible. Techniques will

also be developed for predicting active region

growth, decay and maximum activity stage. The work will

include development of deep-focus time-distance data analysis methods for imaging weak and rapidly

evolving sound-speed structures and mass flows associated

with new emerging magnetic flux in the convection zone,

monitoring and predicting the growth and complexity of the

subsurface structures, and also a search for the deep nests

of long-living complexes of activity ("active longitudes")

and their relationship to the global circulation of the Sun.

An important goal of this investigation is to develop and

deliver software for deep-focus time-distance analysis and

inversions of Solar-B and SDO data.


Performance YearReferenceInvestigation TypeActions
1Nigam, R.; Kosovichev, A. G.; Scherrer, P. H.; (2007)...
not set
1Zhao, J.; Couvidat, S.; Bogart, R. S.; Parchevsky, K...
not set


Performance YearReferenceActions
1Duvall, T. L.; Zhao, J.; Couvidat, S.; Parchevsky, K...

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