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Penumbra (law)

Known as: Penumbra (disambiguation) 
In United States constitutional law, the penumbra includes a group of rights derived, by implication, from other rights explicitly protected in the… 
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2018
2018
The Umbra–Penumbra Area Ratio of Sunspots During the Maunder Minimum
The Maunder Minimum (MM) was a prolonged period of low solar activity that occurred between 1645 and 1715. The true level of… 
2018
2018
A Curious History of Sunspot Penumbrae: An Update
The ratio of penumbral to umbral area of sunspots is an important topic for solar and geophysical studies. Hathaway (Solar Phys… 
2016
2016
Upper Chromospheric Magnetic Field of a Sunspot Penumbra: Observations of Fine Structure
The fine-structure of magnetic field of a sunspot penumbra in the upper chromosphere is to be explored and compared to that in… 
2014
2014
Magneto-seismological insights into the penumbral chromosphere and evidence for wave damping in spicules
Aims: The observation of propagating magneto-hydrodynamic kink waves in magnetic structures and measurement of their properties… 
2013
2013
Bimodal Distribution of Magnetic Fields and Areas of Sunspots
We applied automatic identification of sunspot umbrae and penumbrae to daily observations from the Helioseismic Magnetic Imager… 
2011
2011
The formation of sunspot penumbra - Magnetic field properties
Aims. We study the magnetic flux emergence and formation of a sunspo t penumbra in the active region NOAA 11024. Methods. We… 
Highly Cited
2010
Highly Cited
2010
The formation of a sunspot penumbra
Context. The formation of a penumbra is crucial for our understanding of solar magnetism, but it has not been observed in detail… 
2010
2010
The role of emerging bipoles in the formation of a sunspot penumbra
The generation of magnetic flux in the solar interior and its transport from the convection zone into the photosphere, the… 
1989
1989
A semi-empirical model of sunspot penumbra
Un modele semi-empirique de la penombre des taches solaires, incluant l'equilibre hydrostatique, l'equilibre statistique, le… 
Highly Cited
1978
Highly Cited
1978
Plasma near Venus from the Venera 9 and 10 wide-angle analyzer data
Preliminary results of ion and electron plasma measurements near Venus are presented and discussed. The data were obtained with… 
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