24,769 research outputs found
Solar cycle variation in Sun-as-a-star Ca II 854.2 nm bisectors
The bisector of the strong chromospheric Ca II 854.2 nm line has an inverse-C
shape the cause of which is not yet fully understood. We show that the
amplitude of the bisector in Sun-as-a-star observations exhibits a solar cycle
variation with smaller amplitudes during highest activity. The line core
intensity is lower during solar minima while the part of the bisector most
sensitive to the line core shows no systematic change with activity. Our
results support the use of Ca II 854.2 nm bisectors in studying the
relationship between convection and magnetic fields, not only in the Sun but in
other stars as well.Comment: Accepted to Ap
How Giving Contests Can Strengthen Nonprofits and Communities
Presents a case study of Give to the Max Day: Greater Washington, its financial performance and impact on area nonprofits' relationships with donors, capacity building, and the sector. Outlines successful strategies and tips for nonprofits and organizers
Hispanics, Health Insurance and Health Care Access
Compares the insurance status, usual healthcare provider, reasons for not having a usual provider, health status, and healthcare experiences of Latinos/Hispanics who are not citizens or legal permanent residents with those of Latinos/Hispanics who are
- …