The evolution and decay of sunspots: a high resolution study of flows and magnetic fields in and around sunspots
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| Format: | Thesis Book |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | Inhaltsverzeichnis |
| Physical Description: | 112 S. Ill., graph. Darst. |
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| 100 | 1 | |a Verma, Meetu |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a The evolution and decay of sunspots |b a high resolution study of flows and magnetic fields in and around sunspots |c Meetu Verma |
| 264 | 1 | |c 2013 | |
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| 502 | |a Potsdam, Univ., Diss., 2013 | ||
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Record in the Search Index
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| adam_text | IMAGE 1
TABLE OF CONTENTS
ABSTRACT 1
1 INTRODUCTION 4
1.1 FLOWS ON THE SOLAR SURFACE 4
1.1.1 GRANULATION 4
1.1.2 MESOGRANULATION 5
1.1.3 SUPERGRANULATION 5
1.1.4 FLOWS IN AND AROUND SUNSPOTS 7
1.1.5 EVERSHED FLOW 7
1.1.6 MOAT FLOW AND MOVING MAGNETIC FEATURES 10
1.1.7 SHEAR FLOWS IN AND AROUND ACTIVE REGIONS 12
1.2 METHODS TO MESASURE FLOWS 13
1.3 APPLICATIONS OF CROSS-CORRELATION TECHNIQUES 14
1.3.1 SEA SURFACE VELOCITY 14
1.3.2 CLOUD MOTION WIND 15
1.3.3 PARTICLE IMAGE VELOCIMETRY 16
2 LOCAL CORRELATION TRACKING 17
2.1 OBSERVATIONS 18
2.1.1 HIGH-CADENCE SEQUENCE 18
2.1.2 LONG-DURATION SEQUENCE 19
2.1.3 HIGH-SPATIAL RESOLUTION SEQUENCE 19
2.2 IMPLEMENTATION OF THE LCT ALGORITHM 20
2.2.1 PREPROCESSING OF THE G-BAND IMAGES 20
2.2.2 ALIGNING THE IMAGES WITHIN A TIME-SERIES 20
2.2.3 LCT ALGORITHM 21
2.2.4 LCT DATA PRODUCTS 22
2.2.5 TIMING ISSUES RELATED TO THE IMAGE CAPTURE 24
2.3 RESULTS 25
2.3.1 STATISTICAL PROPERTIES OF FLOW MAPS AND TIME CADENCE SELECTION 25
2.3.2 DETERMINING THE DURATION OF THE TIME AVERAGES 26
2.3.3 SELECTION OF THE SAMPLING WINDOW 27
2.3.4 NUMERICAL ERRORS IN CALCULATING FLOW MAPS 29
2.3.5 LONG-LIVED FEATURES IN FLOW MAPS 29
2.3.6 FREQUENCY DISTRIBUTIONS FOR DIFFERENT SOLAR FEATURES 31
2.3.7 FLOW MAPS FOR DIFFERENT SPATIAL RESOLUTION 32
2.4 CONCLUSIONS 34
3 EVALUATING LOCAL CORRELATION TRACKING USING C05B0LD SIMULATIONS OF
SOLAR GRANULATION 36 3.1 C05B0LD SIMULATION OF GRANULATION 37
3.2 LOCAL CORRELATION TRACKING 38
3.3 RESULTS 38
3.3.1 PERSISTENT FLOWS AND THE DURATION OF TIME AVERAGES 38
3.3.2 CONVERGENCE PROPERTIES OF THE MEAN FLOW SPEEDS 40
3.3.3 MORPHOLOGY OF FLOW MAPS AND FREQUENCY DISTRIBUTIONS OF FLOW SPEEDS
43
HTTP://D-NB.INFO/1043112081
IMAGE 2
3.3.4 DYNAMICS OF HORIZONTAL PROPER MOTIONS 46
3.3.5 COMPARISON WITH PLASMA VELOCITIES 46
3.4 CONCLUSIONS 49
4 FLOW FIELDS IN THE FINAL STAGES OF SUNSPOT DECAY 51
4.1 OBSERVATIONS 52
4.1.1 SDO/HMI FULL-DISK IMAGES 52
4.1.2 HINODE G-BAND AND CAIIH IMAGES 54
4.1.3 HA ECHELLE SPECTRA 54
4.1.4 HINODE SPECTRO-POLARIMETER 55
4.2 RESULTS 55
4.2.1 PHOTOSPHERIC EVOLUTION 55
4.2.2 CHROMOSPHERIC EVOLUTION 58
4.2.3 HORIZONTAL PROPER MOTIONS 59
4.2.4 LINE-OF-SIGHT VELOCITIES 61
4.2.5 MAGNETIC FIELDS 62
4.3 CONCLUSIONS 65
5 THE DECAY OF A SATELLITE SUNSPOT AND THE ROLE OF MAGNETIC FLUX REMOVAL
IN FLARING 66 5.1 OBSERVATIONS 67
5.2 RESULTS 68
5.2.1 MORPHOLOGY 68
5.2.2 DECAY RATES 70
5.2.3 FLOW FIELDS IN PHOTOSPHERE AND CHROMOSPHERE 71
5.2.4 DECORRELATION TIMES 73
5.2.5 HOMOLOGOUS M2.0 FLARE 77
5.3 CONCLUSIONS 77
6 STATISTICAL PROPERTIES OF THE DYNAMICAL ENVIRONMENT AROUND PORES 79
6.1 OBSERVATIONS 81
6.2 SELECTION OF PORES 82
6.3 RESULTS 83
6.3.1 PARAMETERS DESCRIBING MORPHOLOGY OF PORES AND ASSOCIATED FLOW
FIELDS 83 6.3.2 ILLUSTRATIVE EXAMPLES OF THE DATA ANALYSIS 83
6.3.3 AREA VS. PERIMETER 84
6.3.4 FREQUENCY DISTRIBUTIONS 85
6.4 CONCLUSIONS 87
7 CONCLUSIONS 89
BIBLIOGRAPHY 94
ACKNOWLEDGMENTS 108
APPENDIX A - ABSTRACTS 109
APPENDIX B - LIST OF ACRONYMS 111
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| spelling | Verma, Meetu Verfasser aut The evolution and decay of sunspots a high resolution study of flows and magnetic fields in and around sunspots Meetu Verma 2013 112 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Potsdam, Univ., Diss., 2013 Magnetfeldeffekt (DE-588)7573166-6 gnd rswk-swf Sonnenfleck (DE-588)4181827-1 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Sonnenfleck (DE-588)4181827-1 s Magnetfeldeffekt (DE-588)7573166-6 s DE-604 DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=026800656&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Verma, Meetu The evolution and decay of sunspots a high resolution study of flows and magnetic fields in and around sunspots Magnetfeldeffekt (DE-588)7573166-6 gnd Sonnenfleck (DE-588)4181827-1 gnd |
| subject_GND | (DE-588)7573166-6 (DE-588)4181827-1 (DE-588)4113937-9 |
| title | The evolution and decay of sunspots a high resolution study of flows and magnetic fields in and around sunspots |
| title_auth | The evolution and decay of sunspots a high resolution study of flows and magnetic fields in and around sunspots |
| title_exact_search | The evolution and decay of sunspots a high resolution study of flows and magnetic fields in and around sunspots |
| title_full | The evolution and decay of sunspots a high resolution study of flows and magnetic fields in and around sunspots Meetu Verma |
| title_fullStr | The evolution and decay of sunspots a high resolution study of flows and magnetic fields in and around sunspots Meetu Verma |
| title_full_unstemmed | The evolution and decay of sunspots a high resolution study of flows and magnetic fields in and around sunspots Meetu Verma |
| title_short | The evolution and decay of sunspots |
| title_sort | the evolution and decay of sunspots a high resolution study of flows and magnetic fields in and around sunspots |
| title_sub | a high resolution study of flows and magnetic fields in and around sunspots |
| topic | Magnetfeldeffekt (DE-588)7573166-6 gnd Sonnenfleck (DE-588)4181827-1 gnd |
| topic_facet | Magnetfeldeffekt Sonnenfleck Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=026800656&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
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