SVIBOR - Project code: 1-04-047

MINISTRY OF SCIENCE AND TECHNOLOGY

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Project code: 1-04-047


Physical processes in the atmospheres of the Sun and stars


Main researcher: RUŽDJAK, VLADIMIR (41900)


Assistants
Type of research: basic
Duration from: 01/01/91. to 12/01/94.
Papers on project (total): 114
Papers on project quoted in Current Contents: 15
Institution name: Geodetski fakultet, Zagreb (7)
Department/Institute: Hvar Observatory
Address: Kačićeva 26
City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)1 4561 222
Phone: 385 (0)1 445 410
E-mail: vladimir.ruzdjak@uni-zg.x400.hr
Summary: Systematic investigation of the synergetic interaction of the Solar magnetic field with its plasma, transportation of the magnetic energy into other forms, transport and dissipation of the liberated energy. Investigation of radiation transfer and mass transport processes in early type stars and binary systems. Determination of the fundamental astrophysical parameters governing the structure and evolution of binary systems.

Keywords: solar activity, flares, prominences, global structure, early type stars, binary systems,irradiance, variations, structure, evolution

Research goals: The investigation and comprehension of the physical processes giving rise to short-lived and cyclic perturbations in the solar atmosphere and their effects on the interplanetary medium are of fundamental importance for astrophysics. The cycle of solar activity connected to the appearance and evolution of pores, spots, coronal holes, flares, prominence eruptions and coronal mass ejections is considered as an investigation of the active role of the magnetic fields in the solar atmosphere's plasma. The expected contribution is in a better understanding of the conversion of magnetic energy, characteristics of the differential rotation, development of large-scale magnetic structures, characteristics and stability of prominences. Interacting binary stars are the key for the comprehension of the origin and evolution of binary stars in general. In the theory of evolutin of binary stars the most unknown phase is the one where mass exchange between the components occurs. The fundamental parameters of the stars are yet not known with a satisfactory accuracy to allow following the evolution correctly. Investigation of the Be phenomenon - early type stars with a gaseous envelope, is a very attractive topic with the goal to explain the physical processes leading to the formation of the envelope. The contribution will be in a better comprehension of the structure and evolution of binary stars and an attempt will be made to formulate a hypothesis on the origin of the Be phenomenon based on the discovered multiperiodicity of the variability.

COOPERATION - PROJECTS


  1. Name of project: Astronomy and astrophysics
    Name of institution: Central European Initiative

  2. Name of project: YOHKOH-SXT Project "A Study of the Microwave Signature of X-Ray Coronal Holes
    Name of institution: National Astronomical Observatory
    City: Tokio, Japan

  3. Name of project: Investigation of Solar Activity
    Name of institution: Kiepenheuer Institut fuer Sonnenphysik
    City: Freiburg, Njemačka

  4. Name of project: Prticle Beams in the Solar Atmosphere
    Name of institution: Osservatorio Astronomico di Trieste
    City: Trieste, Italia

COOPERATION - INSTITUTIONS


  1. Name of institution: Astronomicky ustav Česke akademie ved
    Type of institution: State institute
    Type of cooperation: Systematic exchange of experts
    City: Prag, Češka Republika

  2. Name of institution: Kiepeheuer-Institut fuer Sonnenphysik
    Type of institution: State institute
    Type of cooperation: Joint project
    City: Freiburg, Njemačka

  3. Name of institution: Metsahovi Radio Research Station, Helsinki Unniversity of Technology
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: Helsinki, Finska

  4. Name of institution: Universitaets-Sternwarte Goettingen
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: Goettingen, Njemačka

  5. Name of institution: Observatoire de Paris
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: Paris, Francuska

  6. Name of institution: Koninklijke Sterrenwacht van Belgie
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: Bruxelles, Belgija

  7. Name of institution: Osservatorio Astronomico di Trieste
    Type of institution: State institute
    Type of cooperation: Joint project
    City: Trieste, Italia

  8. Name of institution: Institut fuer Astronomie, Karl-Franzes Univ. Graz
    Type of institution: University/Faculty
    Type of cooperation: Joint project
    City: Graz, Austrija
Other information about the project.
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