158 citations · 656 across the 26 of their papers we have counts for
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The Great Aurora of January 1770 observed in Spain
V. M. S. Carrasco, E. Aragones, J. Ordaz +1
An analysis is made of the records made by Spanish observers of a notable aurora on 18 January 1770 in order to study the characteristics of this event. The records indicate that t…
The umbra-penumbra area ratio of sunspots during the Maunder Minimum
V. M. S. Carrasco, J. M. García-Romero, J. M. Vaquero +4
The Maunder Minimum (MM) was a prolonged period of low solar activity that occurred between 1645 and 1715. The true level of solar activity corresponding to this epoch is still a m…
A Great Space Weather Event in February 1730
Hisashi Hayakawa, Yusuke Ebihara, José M. Vaquero +9
Aims. Historical records provide evidence of extreme magnetic storms with equatorward auroral extensions before the epoch of systematic magnetic observations. One significant magne…
Sunspot Observations Made by Hallaschka during the Dalton Minimum
V. M. S. Carrasco, J. M. Vaquero, R. Arlt +1
We present and analyse the sunspot observations performed by Franz I. C. Hallaschka in 1814 and 1816. These solar observations were carried out during the so-called Dalton minimum,…
Could a Hexagonal Sunspot Have Been Observed During the Maunder Minimum?
V. M. S. Carrasco, J. M. Vaquero, M. C. Gallego
The Maunder Minimum was the period between 1645 and 1715 whose main characteristic was abnormally low and prolonged solar activity. However, some authors have doubted this low leve…