Temporal and latitudinal variations of Ca-K plage and network area: An implication to meridional flows [PDF]
, 2022 The Ca-K spectroheliograms obtained at the Kodaikanal observatory (KO) are used to generate a uniform time series using the equal contrast technique (ECT) to study the long and short-term variation in the solar chromosphere. The percentage of plage, Enhanced network (EN), Active network (AN), and Quiet network (QN) area at various latitudes is compared
arxiv +1 more source
Transitivity, Moral Latitude, and Supererogation [PDF]
, 2016 On what I take to be the standard account of supererogation, an act is supererogatory if and only if it is morally optional and there is more moral reason to perform it than to perform some permissible alternative. And, on this account, an agent has more
Portmore, Douglas W.
core +1 more source
The Temporal and Spatial Behaviors of CME Occurrence Rate at Different Latitudes [PDF]
, 2022 The statistical study of the Coronal Mass Ejections (CMEs) is a hot topic in solar physics. To further reveal the temporal and spatial behaviors of the CMEs at different latitudes and heights, we analyzed the correlation and phase relationships between the occurrence rate of CMEs, the Coronal Brightness Index (CBI), and the 10.7-cm solar radio flux ...
arxiv +1 more source
Global patterns of plant leaf N and P in relation to temperature and latitude.
Proceedings of the National Academy of Sciences of the United States of America, 2004 A global data set including 5,087 observations of leaf nitrogen (N) and phosphorus (P) for 1,280 plant species at 452 sites and of associated mean climate indices demonstrates broad biogeographic patterns.
P. Reich, J. Oleksyn
semanticscholar +1 more source
Riparian plant litter quality increases with latitude
Scientific Reports, 2017 Plant litter represents a major basal resource in streams, where its decomposition is partly regulated by litter traits. Litter-trait variation may determine the latitudinal gradient in decomposition in streams, which is mainly microbial in the tropics ...
L. Boyero +31 more
semanticscholar +1 more source
Thermal tolerance patterns across latitude and elevation
Philosophical Transactions of the Royal Society of London. Biological Sciences, 2019 Linking variation in species' traits to large-scale environmental gradients can lend insight into the evolutionary processes that have shaped functional diversity and future responses to environmental change. Here, we ask how heat and cold tolerance vary
J. Sunday +9 more
semanticscholar +1 more source
Wing and body size polymorphism in populations of the stonefly Arcynopteryx dichroa McL. (Plecoptera: Perlodidae) in the Ural Mountains, Russia [PDF]
Polar Research, 2016 Specimens from five Arcynopteryx dichroa (McL.) populations were examined to study wing length and body size at different latitudes and altitudes. In northern Europe, female A. dichroa are usually long winged, while males are short winged.
Olga A. Loskutova, Lidia A. Zhiltzova
doaj +1 more source
Scaling asymptotics for ladder sequences of spherical harmonics at caustic latitudes [PDF]
arXiv, 2022 We study the concentration of ladder sequences of spherical harmonics on caustic latitude circles. We prove that they have Airy scaling asymptotics. We also determine the weak* limit of certain empirical measures of $L^2$ norms of restrictions of spherical harmonics to these latitude circles.
arxiv
A Potential New Mechanism for the Butterfly Diagram of the Solar Cycle: Latitude-dependent Radial Flux Transport [PDF]
, 2022 The butterfly diagram of the solar cycle is the equatorward migration of the emergence latitudes of sunspots as the solar cycle evolves. Revealing the mechanism for the butterfly diagram is essential for understanding the solar and stellar dynamo. The equatorward meridional flow at the base of the convection zone (CZ) was believed to be responsible for
arxiv +1 more source
Long-Term Measurements of Sunspot Magnetic Tilt Angles [PDF]
, 2012 Tilt angles of close to 30,600 sunspots are determined using Mount Wilson daily averaged magnetograms taken from 1974 to 2012, and MDI/SoHO magnetograms taken from 1996 to 2010.
D'Silva +9 more
core +1 more source