Year Month Day AO index 2009 AUG 1 -0.777 2009 AUG 2 -1.148 2009 AUG 3 -1.464 2009 AUG 4 -1.348 2009 AUG 5 -0.885 2009 AUG 6 -0.665 2009 AUG 7 -0.555 2009 AUG 8 -0.263 2009 AUG 9 -0.053 2009 AUG 10 -0.058 2009 AUG 11 -0.021 2009 AUG 12 0.049 2009 AUG 13 0.412 2009 AUG 14 0.567 2009 AUG 15 0.457 2009 AUG 16 0.408 2009 AUG 17 0.631 2009 AUG 18 0.955 2009 AUG 19 0.972 2009 AUG 20 0.689 2009 AUG 21 0.390 2009 AUG 22 -0.222 2009 AUG 23 -0.745 2009 AUG 24 -0.825 2009 AUG 25 -0.846 2009 AUG 26 -0.794 2009 AUG 27 -0.620 2009 AUG 28 -0.233 2009 AUG 29 0.749 2009 AUG 30 1.656 2009 AUG 31 1.980 2009 SEP 1 2.088 2009 SEP 2 1.751 2009 SEP 3 1.158 2009 SEP 4 0.879 2009 SEP 5 0.718 2009 SEP 6 0.692 2009 SEP 7 0.734 2009 SEP 8 0.748 2009 SEP 9 0.272 2009 SEP 10 0.038 2009 SEP 11 0.562 2009 SEP 12 0.269 2009 SEP 13 -0.574 2009 SEP 14 -1.125 2009 SEP 15 -1.279 2009 SEP 16 -0.527 2009 SEP 17 0.361 2009 SEP 18 0.217 2009 SEP 19 0.335 2009 SEP 20 0.952 2009 SEP 21 1.277 2009 SEP 22 1.724 2009 SEP 23 1.967 2009 SEP 24 2.113 2009 SEP 25 2.614 2009 SEP 26 3.094 2009 SEP 27 2.695 2009 SEP 28 1.586 2009 SEP 29 0.330 2009 SEP 30 -0.370 2009 OCT 1 -0.409 2009 OCT 2 -0.346 2009 OCT 3 -0.254 2009 OCT 4 -0.216 2009 OCT 5 -0.357 2009 OCT 6 -0.659 2009 OCT 7 -1.285 2009 OCT 8 -2.050 2009 OCT 9 -2.473 2009 OCT 10 -2.574 2009 OCT 11 -2.666 2009 OCT 12 -1.975 2009 OCT 13 -1.024 2009 OCT 14 -0.591 2009 OCT 15 -0.768 2009 OCT 16 -0.803 2009 OCT 17 -0.517 2009 OCT 18 -0.242 2009 OCT 19 -0.843 2009 OCT 20 -1.979 2009 OCT 21 -2.922 2009 OCT 22 -3.415 2009 OCT 23 -3.251 2009 OCT 24 -2.844 2009 OCT 25 -2.475 2009 OCT 26 -1.812 2009 OCT 27 -1.678 2009 OCT 28 -2.101 2009 OCT 29 -2.412 2009 OCT 30 -1.479 2009 OCT 31 0.379