“…Measurements at higher frequencies require higher time resolution in the experimental data which, among the techniques described earlier, has been achieved only for double probe potential difference measurements on rockets and satellites. Such experiments have been performed on more than 15 rockets [121,122,123,124,125,126,127,128,129] and 15 satellites in the ionosphere, magnetosphere, and interplanetary medium [130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148] over a frequency range that has generally been ~ 10 to ~ 105 Hz. Indirect measurements of the electric fields in waves can be made over a similar frequency range by other techniques.…”