Time‐Latitude Distribution of Prominences for 10 Solar Cycles: A Study Using Kodaikanal, Meudon, and Kanzelhohe Data

Chatterjee, Subhamoy; Hegde, Manjunath; Banerjee, D.; Ravindra, B.; McIntosh, Scott W.

doi:10.1029/2019ea000666

Cited by 17 publications

(12 citation statements)

References 63 publications

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“…This recurrent spatio-temporal pattern, approximately 22-years in duration is manifest from 1960 to the present in a host of atmospheric diagnostics, each of which is a tracer of the Sun's global-scale magnetic field. These analyses are also consistent with a systematic analysis of limb prominences over 10 Solar Cycles using images from Kodaikanal, Meudon, and Kanzelhöhe Observatories (Chatterjee et al, 2020). The pattern observed is one and the same with that of M2014 that is illustrated in Figure 2.…”

Section: Strongly Cyclic Behaviorsupporting

confidence: 86%

Deciphering Solar Magnetic Activity: 140 Years Of The ‘Extended Solar Cycle’ – Mapping the Hale Cycle

McIntosh

Leamon

Egeland

et al. 2021

Preprint

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We investigate the occurrence of the ``extended solar cycle'' (ESC) as it occurs in a host observational data spanning 140 years. Investigating coronal, chromospheric, photospheric and interior diagnostics we develop a consistent picture of solar activity migration linked to the 22-year Hale (magnetic) cycle using superposed epoch analysis (SEA) using previously identified Hale cycle termination events as the key time for the SEA. Our analysis shows that the ESC and Hale cycle, as highlighted by the terminator-keyed SEA, is strongly recurrent throughout the entire observational record studied, some 140 years. Applying the same SEA method to the sunspot record confirms that Maunder's butterfly pattern is a subset of the underlying Hale cycle, strongly suggesting that the production of sunspots is not the fundamental feature of the Hale cycle, but the ESC is. The ESC (and Hale cycle) pattern highlights the importance of 55\degree\ latitude in the evolution, and possible production, of solar magnetism.

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Section: Strongly Cyclic Behaviorsupporting

confidence: 86%

Deciphering Solar Magnetic Activity: 140 Years Of The ‘Extended Solar Cycle’ – Mapping the Hale Cycle

McIntosh

Leamon

Egeland

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…This recurrent spatio-temporal pattern, approximately 22-years in duration, is manifest from 1960 to the present in a host of atmospheric diagnostics, each of which is a tracer of the Sun's global-scale magnetic field. These analyses are also consistent with a systematic analysis of limb prominences over 10 Solar Cycles using images from Kodaikanal, Meudon, and Kanzelhöhe Observatories (Chatterjee et al, 2020). The pattern observed is one and the same as that of M2014 that is illustrated in Figure 2.…”

Section: Strongly Cyclic Behaviorsupporting

confidence: 86%

Deciphering Solar Magnetic Activity: 140 Years of the ‘Extended Solar Cycle’ – Mapping the Hale Cycle

et al. 2021

Self Cite

View full text Add to dashboard Cite

We investigate the occurrence of the “extended solar cycle” (ESC) as it occurs in a host of observational data spanning 140 years. Investigating coronal, chromospheric, photospheric, and interior diagnostics, we develop a consistent picture of solar activity migration linked to the 22-year Hale (magnetic) cycle using superposed epoch analysis (SEA) and previously identified Hale cycle termination events as the key time for the SEA. Our analysis shows that the ESC and Hale cycle, as highlighted by the terminator-keyed SEA, is strongly recurrent throughout the entire observational record studied, some 140 years. Applying the same SEA method to the sunspot record confirms that Maunder’s butterfly pattern is a subset of the underlying Hale cycle, strongly suggesting that the production of sunspots is not the fundamental feature of the Hale cycle, but the ESC is. The ESC (and Hale cycle) pattern highlights the importance of $55^{\circ }$ 55 ∘ latitude in the evolution, and possible production, of solar magnetism.

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“…Pohjolainen et al, 2001;Warmuth et al, 2001;Vršnak et al, 2006a;Veronig et al, 2006a), as well as for long-term evolution of the distributions of prominences and polar crown filaments (e.g. Rybák et al, 2011;Xu et al, 2018Xu et al, , 2021Chatterjee et al, 2020). Sunspot drawings are used for the derivation of (hemispheric) sunspot numbers and solar cycle studies (e.g.…”

Section: Introductionmentioning

confidence: 99%

Kanzelhöhe Observatory: Instruments, Data Processing and Data Products

et al. 2021

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Kanzelhöhe Observatory for Solar and Environmental Research (KSO) of the University of Graz (Austria) is in continuous operation since its foundation in 1943. Since the beginning, its main task was the regular observation of the Sun in full disc. In this long time span covering almost seven solar cycles, a substantial amount of data was collected, which is made available online. In this article we describe the separate processing steps from data acquisition to high level products for different observing wavelengths. First of all we present in detail the quality classification, which is important for further processing of the raw images. We show how we construct centre-to-limb variation (CLV) profiles and how we remove large scale intensity variations produced by the telescope optics in order to get images with uniform intensity and contrast. Another important point is an overview of the different data products from raw images to high contrast images with heliographic grids overlaid. As the data products are accessible via different sources, we also present how to get information about the availability and how to obtain these data. Finally, in an appendix, we describe in detail the information in the FITS headers, the file naming and the data hierarchy.

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Time‐Latitude Distribution of Prominences for 10 Solar Cycles: A Study Using Kodaikanal, Meudon, and Kanzelhohe Data

Cited by 17 publications

References 63 publications

Deciphering Solar Magnetic Activity: 140 Years Of The ‘Extended Solar Cycle’ – Mapping the Hale Cycle

Deciphering Solar Magnetic Activity: 140 Years Of The ‘Extended Solar Cycle’ – Mapping the Hale Cycle

Deciphering Solar Magnetic Activity: 140 Years of the ‘Extended Solar Cycle’ – Mapping the Hale Cycle

Kanzelhöhe Observatory: Instruments, Data Processing and Data Products

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