Glossary term: कोरोना
Description: ताराको कोरोना भनेको ताराको वायुमण्डलको वरिपरि रहेको अत्यन्त तातो, कम घनत्वको प्लाज्माको क्षेत्र हो, जुन अन्तरिक्षमा लाखौं किलोमिटरसम्म फैलिन सक्छ।ताराको भित्र चार्ज भएका पदार्थहरूको चलनले डायनामो प्रभावबाट उत्पन्न हुने पर्याप्त बलियो चुम्बकीय क्षेत्र भएका हरेक तारामा कोरोना हुने अपेक्षा गरिन्छ।हाम्रो सूर्यको कोरोनालाई नाङ्गो आँखाले पूर्ण सूर्यग्रहणको समयमा देख्न सकिन्छ, जब सौर्य कोरोना सूर्यको ढाकिएको अथवा छाया परेको ढिक्का/ चक्रको वरिपरि सेतो रंगको अनियमित आकारको क्षेत्रको रूपमा देखिन्छ। सामान्यतया, ताराको कोरोनाको आकार त्यसको चुम्बकीय क्षेत्र र यसको माथिल्लो क्षेत्रमा रहेको बाहिरी ग्यासको दबाबले निर्धारण गर्छ।नक्षत्रीय कोरोनाहरूको तापमान धेरै उच्च हुन्छ । दस लाख केल्भिनभन्दा बढी तापमानमा, सौर्य कोरोना सूर्यको सतहभन्दा धेरै तातो हुन्छ। कोरोनालाई त्यो तापमानसम्म तताउने संयन्त्र निरन्तर अनुसन्धानको विषय हो, तर यो स्पष्ट देखिन्छ कि कोरोनामा फैलिएका चुम्बकीय क्षेत्रहरूले यो प्रक्रियामा मुख्य भूमिका खेल्छन्।सूर्यको कोरोनाको आकार सेकेन्डदेखि महिनासम्मको समयमा परिवर्तन हुन्छ, मुख्यतः सौर्य गतिविधिको प्रतिक्रियामा, जस्तै कोरोनामा प्लाज्मा फ्याँक्ने फ्लेयरहरू, वा कोरोनल मास इजेक्शनले ठूलो मात्रामा चार्ज भएका कणहरू निकाल्छ। यो वर्षौंको समयमा सौर्य चक्रसँगै पनि परिवर्तन हुन्छ - सूर्यको चुम्बकीय क्षेत्रको बल र दिशामा आवधिक परिवर्तन, जसको अवधि लगभग एघार वर्षको हुन्छ। यस प्रकारका परिवर्तनहरू अन्य तारहरूको कोरोनामा पनि समान रूपमा हुने अपेक्षा गरिन्छ।
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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In Other Languages
- अरबिक: الهالة الشمسية (أو الهالة النجمية عند الحديث عن نجوم أخرى)
- जर्मन: Korona
- अंग्रेजी: Corona
- फ्रान्सेली: Couronne
- ईटालियन: Corona
- जापनिज: コロナ(太陽の) (external link)
- कोरियाली: 코로나
- सरल चिनि: 冕
- प्राचिन चिनि: 冕
Related Media
Total Solar Eclipse
Caption: This image represents the total solar eclipse as observed from Kurigram in Bangladesh. Solar eclipses occur when the moon, as seen from earth, passes in front of the Sun. The moon is much smaller than the Sun, it is closer by the night amount that the angular diameters of the Sun and moon are almost the same (~approximately 1/2 a fingertip). Therefore, the moon can cover up the Sun's disk when it passes directly between the Sun and the Earth. The ring of light around the black circle is called the corona.
Credit: Lutfar Rahman Nirjhar
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License: CC-BY-3.0 Creative Commons Attribution 3.0 Unported icons
Total Solar Eclipse from Casper, Wyoming, USA
Caption: This video shows the total solar eclipse of the 21st of August 2017 observed from Casper, Wyoming, USA by a team of astronomers from the European Space Agency (ESA). This video has been sped up considerably, in reality the moment of totality lasted just under two and a half minutes while the time from the Moon first appearing to obscure the Sun until the Sun was completely unobscured was two hours and 48 minutes.
Before the eclipse we can see several sunspots on the Sun. The Moon moves across the Sun, covering the whole solar disk visible from the point on the Earth this video was taken from. At totality we can see the diffuse solar corona which is normally outshone by the bright solar disk.
Note that while edges of the Sun appear brighter just before and just after totality, this is due to exposure time of the camera being adjusted to make the features visible at totality more obvious. Towards the end of the video some thin cloud begins to affect the observations.
Credit: Video credit: ESA/CESAR ; Music copyright: Flight Of The Angel 3 by Chris Blackwell, audionetwork.com
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License: CC-BY-SA-3.0-IGO Creative Commons Attribution-ShareAlike 3.0 IGO icons



