130 citations · 160 across the 4 of their papers we have counts for
4 papers
The long-term solar variability, as reconstructed from historical sources: Several case studies in the 17th -- 18th centuries
Hisashi Hayakawa
On a centennial timescale, solar activity was quantified based on records of instrumental sunspot observations. This article briefly discusses several aspects of the recent archiva…
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…
The Solar and Geomagnetic Storms in May 2024: A Flash Data Report
Hisashi Hayakawa, Yusuke Ebihara, Alexander Mishev +16
In May 2024, the scientific community observed intense solar eruptions that resulted in a great geomagnetic storm and auroral extension, highlighting the need to document and quant…
Relationship of peak fluxes of solar radio bursts and X-ray class of solar flares: Application to early great solar flares
Keitarou Matsumoto, Satoshi Masuda, Masumi Shimojo +1
Large solar flares occasionally trigger significant space-weather disturbances that affect the technological infrastructures of modern civilization, and therefore require further i…