82 citations · 186 across the 5 of their papers we have counts for
5 papers
Strong evidence of low levels of solar activity during the Maunder Minimum
V. M. S. Carrasco, H. Hayakawa, C. Kuroyanagi +2
The Maunder Minimum (MM) was a period of prolonged solar activity minimum between 1645 and 1715. Several works have identified a significant number of problematic spotless days in…
A Curious History of Sunspot Penumbrae: An Update
V. M. S. Carrasco, J. M. Vaquero, R. M. Trigo +1
The ratio of penumbral to umbral area of sunspots is an important topic for solar and geophysical studies. Hathaway (Solar Physics, 286, 347, 2013) found a curious behaviour in thi…
A Normalized Sunspot-Area Series Starting in 1832: an Update
V. M. S. Carrasco, J. M. Vaquero, M. C. Gallego +1
A new normalized sunspot-area series has been reconstructed from the series obtained by the Royal Greenwich Observatory and other contemporary institutions for the period 1874 - 20…
Level and length of cyclic solar activity during the Maunder minimum as deduced from the active day statistics
J. M. Vaquero, G. A. Kovaltsov, I. G. Usoskin +2
The Maunder minimum (MM) of greatly reduced solar activity took place in 1645-1715, but the exact level of sunspot activity is uncertain as based, to a large extent, on historical…
Sunspots during the Maunder Minimum from Machina Coelestis by Hevelius
V. M. S. Carrasco, J. Villalba Álvarez, J. M. Vaquero
We revisited the sunspot observations published by Johannes Hevelius in his book Machina Coelestis (1679) corresponding to the period 1653-1675 (just in the middle of the Maunder M…