TY  - RPRT
TI  - A description of the external and internal quiet daily variation currents at North American locations for a quiet-Sun year.
AU  - W.H. Campbell
PY  - 1983
DO  - 10.1111/j.1365-246x.1983.tb03806.x
UR  - https://pubs.usgs.gov/publication/70011302
ID  - 70011302
ER  -