Hi Laurence and Roelof, Yes that was a big one on the 17th. I dont remember the Dst being depressed to -230nT for some quite long time. My thumbnail estimate says that it could take at least 14 days
Hello Alan, Thank you for the information. I keep an eye on the Kyoto Dst and on he 17th it peaked +45. Such a peek often preceeds a major drop, however this one was very fast and deep. After the min
Hi Roelof yes though I am not sure how well authenticated. The return of Dst from the plunge after a ME impact is always logarithmic. My thoughts on this are that the ring current acts as a reservoir