The IMS satellite EXOS-A (1978-014A) launched into a quasipolar eccentric orbit on February 4. 1978. includes in its payload a plasma wave detector. which has one broadband channel and eleven bandpass channels covering the frequency range 400 Hz to 3 MHz Each channel is connected to an electric dipole antenna and two Faraday cups Since thc Faraday cup responds to electron density fluc... https://www.roneverhart.com/Minnie-Mouse-5-5-Ft-Portable-Beach-Umbrella/