Abstract: Ultralow frequency (ULF) waves at the geomagnetic equator are studied by using a small magnetometer array and a one‐dimensional electromagnetic wave model. Most ULF waves observed at low latitudes have been associated with shear Alfven mode hydromagnetic resonances in the plasmasphere. Near the equator it is difficult to excite these resonances, and the wave activity is attributed to fast mode waves. The phase difference data recorded at longitudinally spaced, equatorial magnetometers shows a marked change around dawn when one station is sunl...
(read more)
Topics: 
Geophysics
Computational physics