GRANT IDEI-531- Objectives | Publications

Nr. of registration CNCSIS 31796/23.11.2007

Project director:

Lect. Dr. Alexandru Marcu

Name of the project

                                  THEORETICAL AND COMPUTATIONAL SIMULATION IN GLOBAL SOLAR AND STELLAR CORONAL SEISMOLOGY:

                                                         CONECTIONS GLOBAL - LOCAL WVES, MAGNETIC FIELDS-VARIABILITY

Abstract

               ONE OF THE FUNDAMENTAL PROPERTIES OF WAVES IN THE SOLAR (AND STELLAR) CORONA IS THAT THEY CARRY INFORMATION

          ABOUT THE PLASMA IN WHICH THEY PROPAGATE. HUGE ERUPTIVE EVENTS, SUCH AS FLARES OR CORONAL MASS EJECTIONS (CMES),

          CAN GENERATE GLOBAL CORONAL WAVES WHICH PROPAGATE OVER DISTANCES COMPARABLE TO THE SOLAR RADIUS. IN THEIR

          PROPAGATION GLOBAL WAVES CAN INTERACT WITH, E.G. LOCAL CORONAL LOOPS OR PROMINENCES GENERATING SECONDARY

          OSCILLATIONS IN THESE STRUCTURES. THE PROPOSED APPLICATION WILL COMBINE OBSERVATIONALLY MEASURABLE QUANTITIES

          (AMPLITUDE, WAVELENGTH, PROPAGATION SPEED, ATTENUATION) AND THEORETICAL MODELS (DISPERSION RELATIONS, EVOLUTIONARY

          EQUATIONS) TO DERIVE QUANTITIES WHICH CANNOT BE MEASURED DIRECTLY (MAGNETIC FIELD, TRANSPORT COEFFICIENTS, SUB-

          STRUCTURE, MAGNETIC MAPS OF THE QUIET SUN, HEATING/COOLING FUNCTIONS)I.E. GLOBAL AND LOCAL WAVES ARE USED TO

          PLASMA AND FIELD DIAGNOSTIC. A PROMISING NEW WAY TO PROBE STELLAR ATMOSPHERE IS TO USE OUR KNOWLEDGE OF CORONAL

          SEISMOLOGY ON THE SUN AND TO APPLY IT TO MORE DISTANT STARS. WE WILL ALSO ENABLE TO EVALUATE THE EFFECTS OF CYCLIC

          MAGNETIC ACTIVITY ON OBSERVED QUANTITIES LIKE ORBITAL PERIOD VARIABILITY. THE SCIENTIFIC PURPOSES OF THIS APPLICATION

          ARE:

          (I) THE INVESTIGATION OF THE PROPERTIES OF CORONAL EIT WAVES AND THEIR USE FOR GLOBAL SOLAR AND STELLAR CORONAL           SEISMOLOGY
           (II) THE INTERACTION BETWEEN GLOBAL EIT WAVES AND CORONAL LOOPS, GENERATION OF LOCAL OSCILLATIONS, SCALING LAWS AND           EXCLUSION CRITERIA FOR LOOP OSCILLATIONS.

          (III) TO INVESTIGATE THE CONNECTION MAGNETIC FIELDS - SOLAR AND STELLAR VARIABILITY

Research Team

• dr. Alexandru Marcu
• dr. Ballai Istvan
• dr. Alexandru Pop
• drd. Vlad Turcu
• drd. Beniamin Orza