Simultaneous Electric Field Measurements Near L = 4 From Conjugate Balloons and Whistlers

Electric field measurements have been obtained simultaneously in conjugate ionospheres by balloons near L = 4 and near the equator by analyses of the motion of whistler ducts near L = 4 and L = 2.7. The observations were conducted from Siple, Antarctica, and R ouyn, Canada, in December 1969. The westward ionospheric electric field components measured by the two conjugate balloons are in agreement with each other, as are the westward equatorial measurements on the two ducts. The equatorial data agree in general with the mapped ionospheric results, although the equatorial measurements are smaller in average magnitude. The southward ionospheric electric field components in the conjugate ionospheres do not bear any simple resemblance to each other.