Characterization of the umbra-penumbra boundary by the vertical component of the magnetic field -- Analysis of ground-based data from the GREGOR Infrared Spectrograph Article Swipe
P. Lindner
,
R. Schlichenmaier
,
N. Bello González
·
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2004.09956
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.48550/arxiv.2004.09956
The vertical component of the magnetic field ($B_\perp$) was found to reach a constant value at the umbra-penumbra boundary of stable sunspots in a recent statistical study of Hinode/SP data. The objective of this work is to verify the existence of a constant value for $B_\perp$ at the umbra-penumbra boundary from ground-based data in the near-infrared wavelengths and to determine its value for GREGOR Infrared Spectrograph (GRIS) data. This is the first statistical study on the Jurcak criterion with ground-based data, and we compare it with the results from Hinode and HMI data. Eleven spectropolarimetric data sets from the GRIS slit-spectograph containing stable sunspots were selected from the GRIS archive (sdc.leibniz-kis.de). SIR inversions including a polarimetric straylight correction are used to produce maps of the magnetic field vector using the Fe 1564.8 and 1566.2 nm lines. Averages of $B_\perp$ along umbra-penumbra boundaries are analyzed for the 11 data sets. Geometric differences between contours at the resulting $B_\perp^{\rm const}$ value and contours in intensity, $ΔP$, are calculated. Averaged over the 11 sunspots, we find a value of $B_\perp=1787\pm100$ gauss. Contours at $B_\perp=B_\perp^{\rm const}$ and contours calculated in intensity maps match from a visual inspection and the geometric distance $ΔP$ was found to be on the order of 2 pixels. Furthermore, the standard deviation between different data sets of averages along umbra--penumbra contours is smaller for $B_\perp$ than for $B_\parallel$ by a factor of 2.4. Our results provide further support to the Jurcak criterion with the existence of an invariable value $B_\perp^{\rm const}$ at the umbra--penumbra boundary. We also found that the geometric difference, $ΔP$, between intensity contours and contours at $B_\perp=B_\perp^{\rm const}$ acts as an index of stability for sunspots.
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Metadata
- Type
- preprint
- Language
- en
- Landing Page
- http://arxiv.org/abs/2004.09956
- https://arxiv.org/pdf/2004.09956
- OA Status
- green
- References
- 24
- Related Works
- 19
- OpenAlex ID
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All OpenAlex metadata
Raw OpenAlex JSON
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https://openalex.org/W3020247219Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.48550/arxiv.2004.09956Digital Object Identifier
- Title
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Characterization of the umbra-penumbra boundary by the vertical component of the magnetic field -- Analysis of ground-based data from the GREGOR Infrared SpectrographWork title
- Type
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preprintOpenAlex work type
- Language
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enPrimary language
- Publication year
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2020Year of publication
- Publication date
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2020-04-21Full publication date if available
- Authors
-
P. Lindner, R. Schlichenmaier, N. Bello GonzálezList of authors in order
- Landing page
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https://arxiv.org/abs/2004.09956Publisher landing page
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https://arxiv.org/pdf/2004.09956Direct link to full text PDF
- Open access
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YesWhether a free full text is available
- OA status
-
greenOpen access status per OpenAlex
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https://arxiv.org/pdf/2004.09956Direct OA link when available
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Physics, Penumbra, Sunspot, Spectrograph, Magnetic field, Spectral line, Astronomy, Medicine, Ischemia, Cardiology, Quantum mechanicsTop concepts (fields/topics) attached by OpenAlex
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0Total citation count in OpenAlex
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19Other works algorithmically related by OpenAlex
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| abstract_inverted_index.order | 204 |
| abstract_inverted_index.reach | 11 |
| abstract_inverted_index.sets. | 148 |
| abstract_inverted_index.study | 26, 73 |
| abstract_inverted_index.using | 128 |
| abstract_inverted_index.value | 14, 43, 61, 158, 174, 248 |
| abstract_inverted_index.$ΔP$, | 163, 262 |
| abstract_inverted_index.(GRIS) | 66 |
| abstract_inverted_index.1564.8 | 131 |
| abstract_inverted_index.1566.2 | 133 |
| abstract_inverted_index.Eleven | 93 |
| abstract_inverted_index.GREGOR | 63 |
| abstract_inverted_index.Hinode | 89 |
| abstract_inverted_index.Jurcak | 76, 240 |
| abstract_inverted_index.factor | 230 |
| abstract_inverted_index.gauss. | 177 |
| abstract_inverted_index.lines. | 135 |
| abstract_inverted_index.recent | 24 |
| abstract_inverted_index.stable | 20, 102 |
| abstract_inverted_index.vector | 127 |
| abstract_inverted_index.verify | 37 |
| abstract_inverted_index.visual | 191 |
| abstract_inverted_index.archive | 109 |
| abstract_inverted_index.between | 151, 212, 263 |
| abstract_inverted_index.compare | 83 |
| abstract_inverted_index.const}$ | 157, 181, 250, 270 |
| abstract_inverted_index.further | 236 |
| abstract_inverted_index.pixels. | 207 |
| abstract_inverted_index.produce | 121 |
| abstract_inverted_index.provide | 235 |
| abstract_inverted_index.results | 87, 234 |
| abstract_inverted_index.smaller | 222 |
| abstract_inverted_index.support | 237 |
| abstract_inverted_index.Averaged | 166 |
| abstract_inverted_index.Averages | 136 |
| abstract_inverted_index.Contours | 178 |
| abstract_inverted_index.Infrared | 64 |
| abstract_inverted_index.analyzed | 143 |
| abstract_inverted_index.averages | 217 |
| abstract_inverted_index.boundary | 18, 49 |
| abstract_inverted_index.constant | 13, 42 |
| abstract_inverted_index.contours | 152, 160, 183, 220, 265, 267 |
| abstract_inverted_index.distance | 196 |
| abstract_inverted_index.magnetic | 5, 125 |
| abstract_inverted_index.selected | 105 |
| abstract_inverted_index.standard | 210 |
| abstract_inverted_index.sunspots | 21, 103 |
| abstract_inverted_index.vertical | 1 |
| abstract_inverted_index.$B_\perp$ | 45, 138, 224 |
| abstract_inverted_index.Geometric | 149 |
| abstract_inverted_index.Hinode/SP | 28 |
| abstract_inverted_index.boundary. | 254 |
| abstract_inverted_index.component | 2 |
| abstract_inverted_index.criterion | 77, 241 |
| abstract_inverted_index.determine | 59 |
| abstract_inverted_index.deviation | 211 |
| abstract_inverted_index.different | 213 |
| abstract_inverted_index.existence | 39, 244 |
| abstract_inverted_index.geometric | 195, 260 |
| abstract_inverted_index.including | 113 |
| abstract_inverted_index.intensity | 186, 264 |
| abstract_inverted_index.objective | 31 |
| abstract_inverted_index.resulting | 155 |
| abstract_inverted_index.stability | 276 |
| abstract_inverted_index.sunspots, | 170 |
| abstract_inverted_index.sunspots. | 278 |
| abstract_inverted_index.boundaries | 141 |
| abstract_inverted_index.calculated | 184 |
| abstract_inverted_index.containing | 101 |
| abstract_inverted_index.correction | 117 |
| abstract_inverted_index.inspection | 192 |
| abstract_inverted_index.intensity, | 162 |
| abstract_inverted_index.invariable | 247 |
| abstract_inverted_index.inversions | 112 |
| abstract_inverted_index.straylight | 116 |
| abstract_inverted_index.($B_\perp$) | 7 |
| abstract_inverted_index.calculated. | 165 |
| abstract_inverted_index.difference, | 261 |
| abstract_inverted_index.differences | 150 |
| abstract_inverted_index.statistical | 25, 72 |
| abstract_inverted_index.wavelengths | 56 |
| abstract_inverted_index.Furthermore, | 208 |
| abstract_inverted_index.Spectrograph | 65 |
| abstract_inverted_index.ground-based | 51, 79 |
| abstract_inverted_index.polarimetric | 115 |
| abstract_inverted_index.$B_\parallel$ | 227 |
| abstract_inverted_index.$B_\perp^{\rm | 156, 249 |
| abstract_inverted_index.near-infrared | 55 |
| abstract_inverted_index.umbra-penumbra | 17, 48, 140 |
| abstract_inverted_index.umbra--penumbra | 219, 253 |
| abstract_inverted_index.slit-spectograph | 100 |
| abstract_inverted_index.spectropolarimetric | 94 |
| abstract_inverted_index.$B_\perp=1787\pm100$ | 176 |
| abstract_inverted_index.$B_\perp=B_\perp^{\rm | 180, 269 |
| abstract_inverted_index.(sdc.leibniz-kis.de). | 110 |
| cited_by_percentile_year | |
| countries_distinct_count | 1 |
| institutions_distinct_count | 3 |
| citation_normalized_percentile.value | 0.03457008 |
| citation_normalized_percentile.is_in_top_1_percent | False |
| citation_normalized_percentile.is_in_top_10_percent | False |