Solar Physics Laboratory - NASA's GSFC

Electron acceleration in solar flares

-   Calculation of bremsstrahlung and gyrosynchrotron emission from model magnetic structures for comparison with RHESSI X-ray and gamma-ray spectroscopic imaging and ground-based microwave imaging (Holman, Ofman, et al.)

Coronal Mass Ejections

-   Observational precursors (Thompson)

-   Propagation characteristics, observational (Thompson, St. Cyr) and theoretical (Spicer)

Impulsive excitation of coronal loops

-   3D MHD models of transverse oscillations of bright coronal loops as observed in EUV by TRACE (Ofman, Davila)

Structure of the chromosphere and transition region

-   Longstanding .He II 304. problem (much greater intensity in this line than expected on the basis of static NLTE theory) finally resolved (Andretta, Jordan, Brosius, Davila, Thomas, Behring, Thompson, Garcia)

Dynamics, mass balance, and temperature distribution in active regions

-   SERTS-95 and .97 scientific results (Brosius, Thomas, Davila) in addition to SOHO/CDS and Yohkoh/SXT calibrations

Third Whole Sun Campaign

-   Exploit the cooperative power of SOHO, Yohkoh, TRACE and ground-based telescopes

-   Sigmoidal active regions produce flares and alter the global corona (Zarro, Thompson et al.)

-   Dynamic structure of coronal jets (Ko, St. Cyr, Thompson et al.)

Theoretical atomic physics applied to astrophysical spectroscopy

-   Accurate energy levels for C IV, O VI and Ne VIII (Bhatia, Drachman)

-   Compare theory and experiment (SERTS) for Si X and Si XI (Keenan, Thomas, Brosius et al.)

Time-distance helioseismology

-   Horizontal subsurface flows detected in solar supergranulation using surface gravity mode (Duvall, Gizon)

-   Development of techniques for far-side imaging of active regions (application to space weather nearcasting)

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