Studies on Space Climate Made in the University of Extremadura (Spain)

Our research group has carried out several studies on space climate in the past. One of our lines of work is the recovery and analysis of the catalogues including historical sunspot observations. We have already published in digital version some sunspot catalogues made in observatories, for example, of the Iberian Peninsula (Aparicio et al. 2018). Recently, we have also digitized the catalogue from the sunspot observations made in the Stonyhurst College Observatory for 1921 – 1935 (Carrasco et al. 2021) and completed the first step for the publication of the Sacramento Peak Observatory sunspot catalogue (1947 – 2004) (Carrasco et al. 2020). Currently, we are analyzing the sunspot observations from drawings made in Boulder (U.S.A) for the period 1966 – 1992 to create a sunspot group catalogue including that information. Furthermore, we have also analyzed long-term observation series made by individual astronomers. Two examples of this kind of studies can be the analysis of the sunspot observations made by David Hadden during the period 1890 – 1931 (Carrasco et al. 2013) and those made by Eric Strach for 1969 – 2008 (Carrasco et al. 2019). Nowadays, in collaboration with other Italian research group, we are studying all the sunspot drawings made by Father Angelo Secchi in the second half of the 19th century. We are constructing the Wolf number, group number and the area series from these drawings. As future work, our objective is to publish a sunspot group catalogue from these observations.

References

Aparicio, A.J.P., Lefèvre, L., Gallego, M.C., Vaquero, J.M., Clette, F., Bravo-Paredes, N., Galaviz, P., Bautista, M.L.: 2018, A Sunspot Catalog for the Period 1952 – 1986 from Observations Made at the Madrid Astronomical Observatory, Solar Physics 293, 164.

Carrasco, V.M.S., Vaquero, J.M., Gallego, M.C., Trigo, R.M.: 2013, Forty two years counting spots: Solar observations by D.E. Hadden during 1890–1931 revisited. New Astronomy 25, 95.

Carrasco, V.M.S, Vaquero, J.M., Olmo-Mateos, V.M.: 2019, Eric Strach: Four Decades of Detailed Synoptic Solar Observations (1969‐2008), Space Weather 17, 796.

Carrasco, V.M.S., Pevtsov, A.A., Nogales, J.M., Vaquero, J.M.: 2020, The Sunspot Drawing Collection of the National Solar Observatory at Sacramento Peak (1947–2004), Solar Physics 296, 3.

Carrasco, V.M.S., Muñoz-Jaramillo, A., Nogales, J.M., Gallego, M.C., Vaquero, J.M.: 2021, Sunspot Catalog (1921–1935) and Area Series (1886–1940) from the Stonyhurst College Observatory, Astrophysical Journal Supplement Series 256, 38.