Magnetic properties of a long-lived sunspot - Vertical magnetic field at the umbral boundary Article Swipe
Markus Schmassmann
,
R. Schlichenmaier
,
N. Bello González
·
YOU?
·
· 2018
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.1810.09358
YOU?
·
· 2018
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.1810.09358
Context. In a recent statistical study of sunspots in 79 active regions, the vertical magnetic field component $B_\text{ver}$ averaged along the umbral boundary is found to be independent of sunspot size. The authors of that study conclude that the absolute value of $B_\text{ver}$ at the umbral boundary is the same for all spots. Aims. We investigate the temporal evolution of $B_\text{ver}$ averaged along the umbral boundary of one long-lived sunspot during its stable phase. Methods. We analysed data from the HMI instrument on-board SDO. Contours of continuum intensity at $I_\text{c}=0.5I_\text{qs}$, whereby $I_\text{qs}$ refers to the average over the quiet sun areas, are used to extract the magnetic field along the umbral boundary. Projection effects due to different formation heights of the Fe I 617.3 nm line and continuum are taken into account. To avoid limb artefacts, the spot is only analysed for heliocentric angles smaller than $60^{\circ}$. Results. During the first disc passage, NOAA AR 11591, $B_\text{ver}$ remains constant at 1693 G with a root-mean-square deviation of 15 G, whereas the magnetic field strength varies substantially (mean 2171 G, rms of 48 G) and shows a long term variation. Compensating for formation height has little influence on the mean value along each contour, but reduces the variations along the contour when away from disc centre, yielding a better match between the contours of $B_\text{ver}=1693$ G and $I_\text{c}=0.5I_\text{qs}$. Conclusions. During the disc passage of a stable sunspot, its umbral boundary can equivalently be defined by using the continuum intensity $I_\text{c}$ or the vertical magnetic field component $B_\text{ver}$. Contours of fixed magnetic field strength fail to outline the umbral boundary.
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Metadata
- Type
- preprint
- Language
- en
- Landing Page
- https://doi.org/10.48550/arxiv.1810.09358
- OA Status
- green
- Cited By
- 6
- References
- 20
- Related Works
- 20
- OpenAlex ID
- https://openalex.org/W2896429192
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W2896429192Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.48550/arxiv.1810.09358Digital Object Identifier
- Title
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Magnetic properties of a long-lived sunspot - Vertical magnetic field at the umbral boundaryWork title
- Type
-
preprintOpenAlex work type
- Language
-
enPrimary language
- Publication year
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2018Year of publication
- Publication date
-
2018-10-22Full publication date if available
- Authors
-
Markus Schmassmann, R. Schlichenmaier, N. Bello GonzálezList of authors in order
- Landing page
-
https://doi.org/10.48550/arxiv.1810.09358Publisher landing page
- Open access
-
YesWhether a free full text is available
- OA status
-
greenOpen access status per OpenAlex
- OA URL
-
https://doi.org/10.48550/arxiv.1810.09358Direct OA link when available
- Concepts
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Sunspot, Physics, Context (archaeology), Astrophysics, Magnetic field, Boundary (topology), Root mean square, Mathematical analysis, Mathematics, Geology, Quantum mechanics, PaleontologyTop concepts (fields/topics) attached by OpenAlex
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6Total citation count in OpenAlex
- Citations by year (recent)
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2021: 2, 2020: 3, 2018: 1Per-year citation counts (last 5 years)
- References (count)
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20Number of works referenced by this work
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20Other works algorithmically related by OpenAlex
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| abstract_inverted_index.boundary | 22, 46, 65, 238 |
| abstract_inverted_index.conclude | 36 |
| abstract_inverted_index.constant | 158 |
| abstract_inverted_index.contour, | 202 |
| abstract_inverted_index.contours | 221 |
| abstract_inverted_index.magnetic | 14, 106, 171, 252, 259 |
| abstract_inverted_index.on-board | 82 |
| abstract_inverted_index.passage, | 152 |
| abstract_inverted_index.regions, | 11 |
| abstract_inverted_index.strength | 173, 261 |
| abstract_inverted_index.sunspot, | 235 |
| abstract_inverted_index.sunspots | 7 |
| abstract_inverted_index.temporal | 57 |
| abstract_inverted_index.vertical | 13, 251 |
| abstract_inverted_index.yielding | 215 |
| abstract_inverted_index.boundary. | 111, 267 |
| abstract_inverted_index.component | 16, 254 |
| abstract_inverted_index.continuum | 86, 127, 246 |
| abstract_inverted_index.deviation | 165 |
| abstract_inverted_index.different | 116 |
| abstract_inverted_index.evolution | 58 |
| abstract_inverted_index.formation | 117, 191 |
| abstract_inverted_index.influence | 195 |
| abstract_inverted_index.intensity | 87, 247 |
| abstract_inverted_index.Projection | 112 |
| abstract_inverted_index.artefacts, | 135 |
| abstract_inverted_index.instrument | 81 |
| abstract_inverted_index.long-lived | 68 |
| abstract_inverted_index.variation. | 188 |
| abstract_inverted_index.variations | 206 |
| abstract_inverted_index.independent | 27 |
| abstract_inverted_index.investigate | 55 |
| abstract_inverted_index.statistical | 4 |
| abstract_inverted_index.$I_\text{c}$ | 248 |
| abstract_inverted_index.Compensating | 189 |
| abstract_inverted_index.Conclusions. | 227 |
| abstract_inverted_index.equivalently | 240 |
| abstract_inverted_index.heliocentric | 142 |
| abstract_inverted_index.$60^{\circ}$. | 146 |
| abstract_inverted_index.$I_\text{qs}$ | 91 |
| abstract_inverted_index.substantially | 175 |
| abstract_inverted_index.$B_\text{ver}$ | 17, 42, 60, 156 |
| abstract_inverted_index.$B_\text{ver}$. | 255 |
| abstract_inverted_index.root-mean-square | 164 |
| abstract_inverted_index.$B_\text{ver}=1693$ | 223 |
| abstract_inverted_index.$I_\text{c}=0.5I_\text{qs}$, | 89 |
| abstract_inverted_index.$I_\text{c}=0.5I_\text{qs}$. | 226 |
| cited_by_percentile_year.max | 97 |
| cited_by_percentile_year.min | 90 |
| countries_distinct_count | 0 |
| institutions_distinct_count | 3 |
| citation_normalized_percentile.value | 0.80614568 |
| citation_normalized_percentile.is_in_top_1_percent | False |
| citation_normalized_percentile.is_in_top_10_percent | False |