Hemispheric Sunspot Number from the Madrid Astronomical Observatory for the Period 1935–1986

Aparicio, A. J. P.; Carrasco, V. M. S.; Gallego, M. C.; Vaquero, J. M.

doi:10.3847/1538-4357/ac5dc6

Cited by 6 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This agrees with the dominant hemispheres obtained in this work but disagrees in the difference in percent between both hemispheres. The result found in this work is similar to that found by Aparicio et al (2022a), who obtained from the Madrid hemispheric sunspot number that the northern hemisphere was dominant (6% larger) in Solar Cycle 17. In addition, Mazumder et al (2021) also obtained, from filament records made in Meudon Observatory, that the asymmetry had a prominent inclination to the northern hemisphere for the period 1919-1966.…”

Section: Asymmetry Indexsupporting

confidence: 92%

“…We have calculated the asymmetry index following the definition used in previous works (Temmer et al 2006;Veronig et al 2021;Aparicio et al 2022a): Δ = N N -N S , where Δ is the asymmetry index, N N is the number of faculae, prominences, or filaments regarding the northern hemisphere, and N S is the same for the southern hemisphere. Figure 8 shows the temporal evolution of the monthly asymmetry index obtained from the number of faculae, prominences, and filaments recorded in the COI catalog.…”

Section: Asymmetry Indexmentioning

confidence: 99%

See 1 more Smart Citation

A Catalog of Faculae, Prominences, and Filaments for the Period 1929–1944 from the Astronomical Observatory of the University of Coimbra

Carrasco

Vaquero

2022

ApJS

Self Cite

View full text Add to dashboard Cite

The Astronomical Observatory of the University of Coimbra (Portugal) published a catalog with solar observations such as sunspots, faculae, prominences, and filaments for the period 1929–1944. In previous works, a machine-readable version on sunspot observations made in Coimbra was published. Here we extend that work and present a digital version of the facula, prominence, and filament observations made in that observatory. We have applied a quality control to the catalog, obtaining that the percentage of problematic or suspicious data found is lower than 1% of the total number of observations. In addition, we show an analysis of this catalog, as well as some comparisons between solar indices calculated from Coimbra data and those from other sources. Historical observations of faculae, prominences, and filaments are not as common as sunspot records, and in addition, few historical series of these solar features are available in digital version. For that reason, the catalog of solar observations published by the Coimbra Observatory is of enormous value. The recovery, publication, and availability of this catalog provide the scientific community with a valuable data set of solar characteristics that will help us to study in more detail the past solar magnetic field and long-term solar activity.

show abstract

Section: Asymmetry Indexsupporting

confidence: 92%

Section: Asymmetry Indexmentioning

confidence: 99%

A Catalog of Faculae, Prominences, and Filaments for the Period 1929–1944 from the Astronomical Observatory of the University of Coimbra

Carrasco

Vaquero

2022

ApJS

Self Cite

View full text Add to dashboard Cite

show abstract

A Sunspot Catalog by Rafael Carrasco at the Madrid Astronomical Observatory for the Period 1931 – 1933

et al. 2022

View full text Add to dashboard Cite

A sunspot catalog was published by the Madrid Astronomical Observatory from sunspot observations made by Rafael Carrasco and his assistants for the period November 1931 – December 1933. We have digitized this catalog and carried out a quality control to detect inconsistencies. We present a machine-readable version of this sunspot catalog together with an erratum list. Moreover, we compared the Madrid sunspot number and area with other reference series. We found that sunspots in the northern hemisphere were predominant during this period, confirming previous studies. We have also analyzed the group morphological typologies registered in the catalog and show a butterfly diagram drawn with this new information. A comparison with the sunspot catalog by the Royal Greenwich Observatory shows that almost all the groups included in the Carrasco’s catalog are also present in the aforementioned catalog.

show abstract

Hemispheric Sunspot Numbers from the Astronomical Observatory of the University of Valencia (1940 – 1956)

et al. 2023

View full text Add to dashboard Cite

In this work, we present hemispheric sunspot number counts made in the Astronomical Observatory of the University of Valencia for the period 1940 – 1956. We found these data in a secondary source (the bulletins of the Madrid Astronomical Observatory). We digitized the hemispheric sunspot number and group number recorded by the observers. Unfortunately, the sunspot positions or areas were not published in this secondary source. A machine-readable version of the dataset is available as supplementary material. We compare the Valencia hemispheric series with others from other observatories, such as the Madrid Astronomical Observatory, finding similar hemispheric behaviors. We also computed the asymmetry index from the hemispheric data. We found that the northern hemisphere was predominant in our study period (declining phase of Solar Cycle 17, Solar Cycle 18, and rising phase of Solar Cycle 19), and the southern hemisphere was leading. These results agree with those obtained in previous studies. Therefore, the Valencia hemispheric records are one more piece of information to know the behavior of the northern and southern hemispheres during the 20th century.

show abstract

Hemispheric Sunspot Number from the Madrid Astronomical Observatory for the Period 1935–1986

Cited by 6 publications

References 28 publications

A Catalog of Faculae, Prominences, and Filaments for the Period 1929–1944 from the Astronomical Observatory of the University of Coimbra

A Catalog of Faculae, Prominences, and Filaments for the Period 1929–1944 from the Astronomical Observatory of the University of Coimbra

A Sunspot Catalog by Rafael Carrasco at the Madrid Astronomical Observatory for the Period 1931 – 1933

Hemispheric Sunspot Numbers from the Astronomical Observatory of the University of Valencia (1940 – 1956)

Contact Info

Product

Resources

About