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THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS
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| Zeitschriftentitel: | The Astrophysical Journal Letters |
|---|---|
| Personen und Körperschaften: | |
| In: | The Astrophysical Journal Letters, 820, 2016, 1, S. L13 |
| Format: | E-Article |
| Sprache: | Unbestimmt |
| veröffentlicht: |
American Astronomical Society
|
| Schlagwörter: |
| author_facet |
Wang, Y.-M. Wang, Y.-M. |
|---|---|
| author |
Wang, Y.-M. |
| spellingShingle |
Wang, Y.-M. The Astrophysical Journal Letters THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS Space and Planetary Science Astronomy and Astrophysics |
| author_sort |
wang, y.-m. |
| spelling |
Wang, Y.-M. 2041-8205 2041-8213 American Astronomical Society Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.3847/2041-8205/820/1/l13 <jats:title>ABSTRACT</jats:title> <jats:p>Although most of the solar surface outside active regions (ARs) is pervaded by small-scale fields of mixed polarity, this magnetic “carpet” or “junkyard” is thought to be largely absent inside AR plages and strong network. However, using extreme-ultraviolet images and line-of-sight magnetograms from the <jats:italic>Solar Dynamics Observatory</jats:italic>, we find that unipolar flux concentrations, both inside and outside ARs, often have small, loop-shaped Fe <jats:sc>ix</jats:sc> 17.1 and Fe <jats:sc>xii</jats:sc> 19.3 nm features embedded within them, even though no minority-polarity flux is visible in the corresponding magnetograms. Such looplike structures, characterized by horizontal sizes of ∼3–5 Mm and varying on timescales of minutes or less, are seen inside bright 17.1 nm moss, as well as in fainter moss-like regions associated with weaker network outside ARs. We also note a tendency for bright coronal loops to show compact, looplike features at their footpoints. Based on these observations, we suggest that present-day magnetograms may be substantially underrepresenting the amount of minority-polarity flux inside plages and strong network, and that reconnection between small bipoles and the overlying large-scale field could be a major source of coronal heating both in ARs and in the quiet Sun.</jats:p> THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS The Astrophysical Journal Letters |
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American Astronomical Society, 2016 |
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American Astronomical Society, 2016 |
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2041-8205 2041-8213 |
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American Astronomical Society |
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The Astrophysical Journal Letters |
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| title |
THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_unstemmed |
THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_full |
THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_fullStr |
THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_full_unstemmed |
THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_short |
THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_sort |
the ubiquitous presence of looplike fine structure inside solar active regions |
| topic |
Space and Planetary Science Astronomy and Astrophysics |
| url |
http://dx.doi.org/10.3847/2041-8205/820/1/l13 |
| publishDate |
2016 |
| physical |
L13 |
| description |
<jats:title>ABSTRACT</jats:title>
<jats:p>Although most of the solar surface outside active regions (ARs) is pervaded by small-scale fields of mixed polarity, this magnetic “carpet” or “junkyard” is thought to be largely absent inside AR plages and strong network. However, using extreme-ultraviolet images and line-of-sight magnetograms from the <jats:italic>Solar Dynamics Observatory</jats:italic>, we find that unipolar flux concentrations, both inside and outside ARs, often have small, loop-shaped Fe <jats:sc>ix</jats:sc> 17.1 and Fe <jats:sc>xii</jats:sc> 19.3 nm features embedded within them, even though no minority-polarity flux is visible in the corresponding magnetograms. Such looplike structures, characterized by horizontal sizes of ∼3–5 Mm and varying on timescales of minutes or less, are seen inside bright 17.1 nm moss, as well as in fainter moss-like regions associated with weaker network outside ARs. We also note a tendency for bright coronal loops to show compact, looplike features at their footpoints. Based on these observations, we suggest that present-day magnetograms may be substantially underrepresenting the amount of minority-polarity flux inside plages and strong network, and that reconnection between small bipoles and the overlying large-scale field could be a major source of coronal heating both in ARs and in the quiet Sun.</jats:p> |
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| author | Wang, Y.-M. |
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| description | <jats:title>ABSTRACT</jats:title> <jats:p>Although most of the solar surface outside active regions (ARs) is pervaded by small-scale fields of mixed polarity, this magnetic “carpet” or “junkyard” is thought to be largely absent inside AR plages and strong network. However, using extreme-ultraviolet images and line-of-sight magnetograms from the <jats:italic>Solar Dynamics Observatory</jats:italic>, we find that unipolar flux concentrations, both inside and outside ARs, often have small, loop-shaped Fe <jats:sc>ix</jats:sc> 17.1 and Fe <jats:sc>xii</jats:sc> 19.3 nm features embedded within them, even though no minority-polarity flux is visible in the corresponding magnetograms. Such looplike structures, characterized by horizontal sizes of ∼3–5 Mm and varying on timescales of minutes or less, are seen inside bright 17.1 nm moss, as well as in fainter moss-like regions associated with weaker network outside ARs. We also note a tendency for bright coronal loops to show compact, looplike features at their footpoints. Based on these observations, we suggest that present-day magnetograms may be substantially underrepresenting the amount of minority-polarity flux inside plages and strong network, and that reconnection between small bipoles and the overlying large-scale field could be a major source of coronal heating both in ARs and in the quiet Sun.</jats:p> |
| doi_str_mv | 10.3847/2041-8205/820/1/l13 |
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| format_dezwi2 | Article, E-Article |
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| format_nrw | Article, E-Article |
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| imprint | American Astronomical Society, 2016 |
| imprint_str_mv | American Astronomical Society, 2016 |
| institution | DE-D275, DE-Bn3, DE-Brt1, DE-Zwi2, DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229 |
| issn | 2041-8205, 2041-8213 |
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| publishDate | 2016 |
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| publisher | American Astronomical Society |
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| series | The Astrophysical Journal Letters |
| source_id | 49 |
| spelling | Wang, Y.-M. 2041-8205 2041-8213 American Astronomical Society Space and Planetary Science Astronomy and Astrophysics http://dx.doi.org/10.3847/2041-8205/820/1/l13 <jats:title>ABSTRACT</jats:title> <jats:p>Although most of the solar surface outside active regions (ARs) is pervaded by small-scale fields of mixed polarity, this magnetic “carpet” or “junkyard” is thought to be largely absent inside AR plages and strong network. However, using extreme-ultraviolet images and line-of-sight magnetograms from the <jats:italic>Solar Dynamics Observatory</jats:italic>, we find that unipolar flux concentrations, both inside and outside ARs, often have small, loop-shaped Fe <jats:sc>ix</jats:sc> 17.1 and Fe <jats:sc>xii</jats:sc> 19.3 nm features embedded within them, even though no minority-polarity flux is visible in the corresponding magnetograms. Such looplike structures, characterized by horizontal sizes of ∼3–5 Mm and varying on timescales of minutes or less, are seen inside bright 17.1 nm moss, as well as in fainter moss-like regions associated with weaker network outside ARs. We also note a tendency for bright coronal loops to show compact, looplike features at their footpoints. Based on these observations, we suggest that present-day magnetograms may be substantially underrepresenting the amount of minority-polarity flux inside plages and strong network, and that reconnection between small bipoles and the overlying large-scale field could be a major source of coronal heating both in ARs and in the quiet Sun.</jats:p> THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS The Astrophysical Journal Letters |
| spellingShingle | Wang, Y.-M., The Astrophysical Journal Letters, THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS, Space and Planetary Science, Astronomy and Astrophysics |
| title | THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_full | THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_fullStr | THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_full_unstemmed | THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_short | THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| title_sort | the ubiquitous presence of looplike fine structure inside solar active regions |
| title_unstemmed | THE UBIQUITOUS PRESENCE OF LOOPLIKE FINE STRUCTURE INSIDE SOLAR ACTIVE REGIONS |
| topic | Space and Planetary Science, Astronomy and Astrophysics |
| url | http://dx.doi.org/10.3847/2041-8205/820/1/l13 |