TY  - RPRT
TI  - Polar coronal hole density and its solar wind consequences using LASCO observations
AU  - Guhathakurta, M.
AU  - Biesecker, D.
AU  - Gibson, S.
AU  - Fisher, R.
PY  - 1997
UR  - https://ntrs.nasa.gov/citations/19990028092
ID  - 19990028092
ER  -