TY  - RPRT
TI  - How active was solar cycle 22?
AU  - Hoegy, W. R.
AU  - Pesnell, W. D.
AU  - Woods, T. N.
AU  - Rottman, G. J.
PY  - 1993
UR  - https://ntrs.nasa.gov/citations/19930067210
ID  - 19930067210
ER  -