Determination of Transverse Density Structuring from Propagating MHD Waves in the Solar Atmosphere

We present a Bayesian seismology inversion technique for propagating magnetohydrodynamic (MHD) transverse waves observed in coronal waveguides. The technique uses theoretical predictions for the spatial damping of propagating kink waves in transversely inhomogeneous coronal waveguides. It combines wave amplitude damping length scales along the waveguide with theoretical results for resonantly damped propagating kink waves to infer the plasma density variation across the oscillating structures. Provided the spatial dependence of the velocity amplitude along the propagation direction is measured and the existence of two different damping regimes is identified, the technique would enable us to fully constrain the transverse density structuring, providing estimates for the density contrast and its transverse inhomogeneity length scale

The Contexts of Conversion among U.S. Latinos

The growth of Protestantism among U.S. Latinos has been the focus of considerable discussion among researchers. Yet few studies investigate how Latino Protestants and Latino Catholics differ, or which types of Latinos convert from Catholicism to Protestantism. Our study tests various theories about why some Latinos convert including a modified version of the semi-involuntary thesis, the national origin hypothesis, and assimilation theory. We use data from a large national sample of U.S. Latinos and find some support for assimilation theory and less for the semi-involuntary thesis. However, context matters. If we divide Latinos into national origin groups, these groups strongly predict who converts and who are lifelong Protestants. We discuss how war may influence the religious composition of early migrants and thus shape both the religious composition and conversion of later migrants

Height variation of the vector magnetic field in solar spicules

Proving the magnetic configuration of solar spicules has hitherto been difficult due to the lack of spatial resolution and image stability during off-limb ground-based observations. We report spectropolarimetric observations of spicules taken in the He I 1083 nm spectral region with the Tenerife Infrared Polarimeter II at the German Vacuum Tower Telescope of the Observatorio del Teide (Tenerife; Canary Islands; Spain). The data provide the variation with geometrical height of the Stokes I, Q, U, and V profiles whose encoded information allows the determination of the magnetic field vector by means of the HAZEL inversion code. The inferred results show that the average magnetic field strength at the base of solar spicules is about 80 gauss and then it decreases rapidly with height to about 30 gauss at a height of 3000 km above the visible solar surface. Moreover, the magnetic field vector is close to vertical at the base of the chromosphere and has mid inclinations (about 50 degree) above 2 Mm height.Comment: Published in ApJ Letter