Daily estimates of the Earth's pole position have been obtained with measurements from a worldwide network of Global Positioning System (GPS) receivers, obtained during the three week GIG'91 experiment in January–February, ...

The effect of thermospheric heating on the F‐region ionization is studied on a daily basis. It is found that at Puerto Rico, during the morning hours, electron density at fixed heights and maximum electron density, in ...

The John Adam Fleming Medal, given for original research and technical leadership in geomagnetism, atmospheric electricity, aeronomy, and related sciences, was presented to Alexander Dalgarno at the AGU Spring Meeting Honor ...

Impulsive changes in the solar wind can deposit energy into magnetospheric cavity modes. We discuss the coupling of cavity modes to the field line continuum, and show that the time scales for dissipative phase mixing and ...

Dan Barfod la Cour was born in Copenhagen September 12, 1876, the son of Poul la Cour, Danish physicist, who was then Superintendent at the Danish Meteorological Institute and later became teacher with the title of Professor ...

Daniel A. Valencio, Professor of Geophysics at Buenos Aires University, died on May 28, 1987, shortly before his 59th birthday. A pioneer of paleomagnetism and tectonophysics in Latin America, Valencio was an outstanding ...

Daniel Lyman Hazard reached the close of his official career on February 29, 1936, when he retired from duty as Chief Magnetician of the United States Coast and Geodetic Survey. A graduate of Brown University, and with a ...

A boundary integral equation method (BIEM) for Darcy's flow with spatially varied permeability is developed. The formulation requires that Green's function be found for each given permeability variation. For a few permeability ...