https://stereo-ssc.nascom.nasa.gov/pub/beacon/ahead/secchi/img/hi_2/20190527/?C=N;O=A
Index of /pub/beacon/ahead/secchi/img/hi_2/20190527
index ofpubbeaconaheadsecchi
https://stereo-ssc.nascom.nasa.gov/pub/beacon/ahead/secchi/img/hi_2/20190527/?C=S;O=D
Index of /pub/beacon/ahead/secchi/img/hi_2/20190527
index ofpubbeaconaheadsecchi