25 research outputs found
How to use magnetic field information for coronal loop identification?
The structure of the solar corona is dominated by the magnetic field because
the magnetic pressure is about four orders of magnitude higher than the plasma
pressure. Due to the high conductivity the emitting coronal plasma (visible
e.g. in SOHO/EIT) outlines the magnetic field lines. The gradient of the
emitting plasma structures is significantly lower parallel to the magnetic
field lines than in the perpendicular direction. Consequently information
regarding the coronal magnetic field can be used for the interpretation of
coronal plasma structures. We extrapolate the coronal magnetic field from
photospheric magnetic field measurements into the corona. The extrapolation
method depends on assumptions regarding coronal currents, e.g. potential fields
(current free) or force-free fields (current parallel to magnetic field). As a
next step we project the reconstructed 3D magnetic field lines on an EIT-image
and compare with the emitting plasma structures. Coronal loops are identified
as closed magnetic field lines with a high emissivity in EIT and a small
gradient of the emissivity along the magnetic field.Comment: 14 pages, 3 figure
Frequency drifts of 3-min oscillations in microwave and EUV emission above sunspots
We analyse 3-min oscillations of microwave and EUV emission generated at
different heights of a sunspot atmosphere, studying the amplitude and frequency
modulation of the oscillations, and its relationship with the variation of the
spatial structure of the oscillations. High-resolution data obtained with the
Nobeyama Radioheliograph, TRACE and SDO/AIA are analysed with the use of the
Pixelised Wavelet Filtering and wavelet skeleton techniques. 3-min oscillations
in sunspots appear in the form of repetitive trains of the duration 8-20 min
(13 min in average). The typical interval between the trains is 30-50 min. The
oscillation trains are transient in frequency and power. We detected a
repetitive frequency drifts of 3-min oscillations during the development of
individual trains. Wavelet analysis shows three types of the frequency drift:
positive, negative and fluctuations without drift. The start and end of the
drifts coincide with the start time and end of the train. The comparative study
of 3-min oscillations in the sequences of microwave and EUV images show the
appearance of new sources of the oscillations in sunspots during the
development of the trains. These structures can be interpreted as waveguides
that channel upward propagating waves, responsible for 3-min oscillations. A
possible explanation of the observed properties is the operation of two
simultaneous factors: dispersive evolution of the upwardly-propagating wave
pulses and the non-uniformity of the distribution of the oscillation power over
the sunspot umbra with different wave sources corresponding to different
magnetic flux tubes with different physical conditions and line-of-sight
angles.Comment: 12 pages, 11 figures, submitted to A&A, 201
Observations of the Sun at Vacuum-Ultraviolet Wavelengths from Space. Part II: Results and Interpretations
Analyzing high school students’ reasoning about electromagnetic induction
Electromagnetic induction is an important, yet complex, physics topic that is a part of Croatian high school curriculum. Nine Croatian high school students of different abilities in physics were interviewed using six demonstration experiments from electromagnetism (three of them concerned the topic of electromagnetic induction). Students were asked to observe, describe, and explain the experiments. The analysis of students’ explanations indicated the existence of many conceptual and reasoning difficulties with the basic concepts of electromagnetism, and especially with recognizing and explaining the phenomenon of electromagnetic induction. Three student mental models of electromagnetic induction, formed during the interviews, which reoccurred among students, are described and analyzed within the knowledge-in-pieces framework
Cenozoic granitoids in the Dinarides of southern Serbia: age of intrusion, isotope geochemistry, exhumation history and significance for the geodynamic evolution of the Balkan Peninsula
Two age groups were determined for the Cenozoic granitoids in the Dinarides of southern Serbia by high-precision single grain U–Pb dating of thermally annealed and chemically abraded zircons: (1) Oligocene ages (Kopaonik, Drenje, Z ˇ eljin) ranging from 31.7 to 30.6 Ma (2) Miocene ages (Golija and Polumir) at 20.58–20.17 and 18.06–17.74 Ma, respectively. Apatite fission-track central ages, modelling combined with zircon central ages and additionally, local structural observations constrain the subsequent exhumation history of the magmatic rocks. They indicate rapid cooling from above 300°C to ca. 80°C between 16 and 10 Ma for both age groups, induced by extensional exhumation of the plutons located in the footwall of core complexes. Hence, Miocene magmatism and core-complex formation not only affected the Pannonian basin but also a part of the mountainous areas of the internal Dinarides. Based on an extensive set of existing age data combined with our own analyses, we propose a geodynamical model for the Balkan Peninsula: The Late Eocene to Oligocene magmatism, which affects the Adria derived lower plate units of the internal Dinarides, was caused by delamination of the Adriatic mantle from the overlying crust, associated with post-collisional convergence that propagated outward into the external Dinarides. Miocene magmatism, on the other hand, is associated with core-complex formation along the southern margin of the Pannonian basin, probably associated with the W-directed subduction of the European lithosphere beneath the Carpathians and interfering with ongoing Dinaridic–Hellenic back-arc extension
Towards Resilient Cities in Serbia
The problems of climate change and the concepts of resilient cities and resilience to climate change have gained considerable attention and interest in Serbia over recent years, especially after the catastrophic floods that hit Serbia in 2014. Now the improvement of resilience in the face of natural, socioeconomic, and political uncertainty and risks has captured the attention of researchers and decision-makers in almost all disciplines and sectors. This paper, through an analysis of the literature on climate change, with a special focus on Serbia, as well as Serbian legal regulations, strategies and planning documents, will show the awareness and understanding of resilience in the Serbian planning policy arena. Special attention is paid to local governments and the issue of climate change, and the problem of how planners, planning policy and decision-makers take into account or deal with the risks that it presents