The study of umbral dots in sunspots based on SOT/Hinode observations
| Autor: | V. Abbasvand, H. Pourjavadi, Hossein Ebadi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Sunspot 010504 meteorology & atmospheric sciences Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Intensity (physics) Space and Planetary Science 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics High Energy Physics::Experiment 010303 astronomy & astrophysics 0105 earth and related environmental sciences Energy transport |
| Zdroj: | Astronomische Nachrichten. 338:662-670 |
| ISSN: | 1521-3994 0004-6337 |
| DOI: | 10.1002/asna.201713311 |
| Popis: | To understand the energy transport in sunspots, it is necessary to investigate the dynamic properties of umbral dots (UDs). In this connection, we used high-resolution SOT/Hinode time-series images. The intensity oscillations of UDs are determined. We conclude that their periods are in the range of 3–5 min, which may be related to the propagation of p-modes through them. We follow the motion path of UDs and investigate whether they are oscillating quasi-periodically. Moreover, we detect their transverse motion and obtain two different periods for these oscillations. Finally, we analyze the diameter of UDs as circular spots. We find that the UDs fluctuate in size. |
| Databáze: | OpenAIRE |
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