It is unclear if anything dramatic happened when Comet Siding Spring came within 87,000 miles of Mars. It seems the ion tail did not sweep across Mars atmosphere. However, as various NASA posts appear to show the various spacecraft hid behind the planet in order to avoid possible danger. We may expect information to dribble out over the next few weeks – that appears to be the norm. See for example http://phys.org/print333106813.html and http://phys.org/print333304301.html
Note … the image above is composite – taken by the Hubble Space Telescope. As far as the Electric Universe is concerned – another damp squib.
The situation with Comet Churyumov-Gerasimenko is a little different. Lots of information is being bounced back by ESA. At http://phys.org/print333304182.html … we have spectacular streams of dust being emitted by the comet. Lots of activity seems to be going on all over the comet, yet is is still 450,000km from the Sun.
At http://phys.org/print333276834.html … it seems the Rosetta Mission has detected some intriguing chemical signatures on Churyumov-Gerasimenko. These include ammonia, methane, hydrogen sulphide, hydrogen cyanide, and formaldehyde, among other things. Strangely, in spite of the fact they can see a big rock in their camera they are still talking about an icy comet. Is this theory squashing reality?