Recalibration of the sunspot-number: status report
We report progress on the ongoing recalibration of the Wolf sunspot number (SN) and group-
sunspot number (GN) following the release of version 2.0 of SN in 2015. This report …
sunspot number (GN) following the release of version 2.0 of SN in 2015. This report …
Thaddäus Derfflinger's sunspot observations during 1802–1824: a primary reference to understand the Dalton Minimum
H Hayakawa, BP Besser, T Iju, R Arlt… - The Astrophysical …, 2020 - iopscience.iop.org
As we are heading toward the next solar cycle, presumably with a relatively small amplitude,
it is of significant interest to reconstruct and describe the past secular minima on the basis of …
it is of significant interest to reconstruct and describe the past secular minima on the basis of …
The Dalton minimum and John Dalton's auroral observations
SM Silverman, H Hayakawa - Journal of Space Weather and …, 2021 - swsc-journal.org
In addition to the regular Schwabe cycles of approximately 11 y,“prolonged solar activity
minima” have been identified through the direct observation of sunspots and aurorae, as …
minima” have been identified through the direct observation of sunspots and aurorae, as …
A new reconstruction of the Sun's magnetic field and total irradiance since 1700
YM Wang, JL Lean - The Astrophysical Journal, 2021 - iopscience.iop.org
We model the Sun's large-scale magnetic field and total solar irradiance (TSI) since 1700 by
combining flux transport simulations with empirical relationships between facular …
combining flux transport simulations with empirical relationships between facular …
The solar corona during the total eclipse on 1806 June 16: Graphical evidence of the coronal structure during the Dalton minimum
Visible coronal structure, in particular the spatial evolution of coronal streamers, provides
indirect information about solar magnetic activity and the underlying solar dynamo. Their …
indirect information about solar magnetic activity and the underlying solar dynamo. Their …
The origin of parity changes in the solar cycle
Although sunspots have been systematically observed on the Sun's surface over the last
four centuries, their magnetic properties have been revealed and documented only since the …
four centuries, their magnetic properties have been revealed and documented only since the …
Space climate and space weather over the past 400 years: 2. Proxy indicators of geomagnetic storm and substorm occurrence
Using the reconstruction of power input to the magnetosphere presented in Paper 1
Lockwood et al.[J Space Weather Space Clim 7 (2017a)], we reconstruct annual means of …
Lockwood et al.[J Space Weather Space Clim 7 (2017a)], we reconstruct annual means of …
Christian Horrebow's sunspot observations–II. Construction of a record of sunspot positions
C Karoff, CS Jørgensen, V Senthamizh Pavai, R Arlt - Solar Physics, 2019 - Springer
The number of spots on the surface of the Sun is one of the best tracers of solar variability
we have. The sunspot number is not only known to change in phase with the 11-year solar …
we have. The sunspot number is not only known to change in phase with the 11-year solar …
The heliospheric Hale cycle over the last 300 years and its implications for a “lost” late 18th century solar cycle
MJ Owens, KG McCracken, M Lockwood… - Journal of Space …, 2015 - swsc-journal.org
A Hale cycle, one complete magnetic cycle of the Sun, spans two complete Schwabe cycles
(also referred to as sunspot and, more generally, solar cycles). The approximately 22-year …
(also referred to as sunspot and, more generally, solar cycles). The approximately 22-year …
Iwahashi Zenbei's sunspot drawings in 1793 in Japan
Three Japanese sunspot drawings associated with Iwahashi Zenbei (1756–1811) are
shown here from contemporary manuscripts and woodprint documents with the relevant …
shown here from contemporary manuscripts and woodprint documents with the relevant …