Dendrobium jenkinsii

Dear all,
This morning - to my horror, I have discovered huge spots on one of my favorite orchids - D. Jenkinsii.
Here you can see a pair of photos I've taken this morning and a photo pf it blooming richly a month ago:
www.flickr.com/photos/auctus/
(It's my first post here so i can't add a photo inside the text yet - sorry)

The day before yesterday I've watered it and it was fine. I have this plant for some 8 years and it's always been very healthy. Can't stand the thought of it dying from this.

Any ideas what this could be? Maybe some chemicals were introduced into the water reservoir during the last rain? I dip my plants in a bucket which I fill from that reservoir which collects water from the roof. I have only dipped this plant two days ago after it heavily rained - and the color of the water was a bit suspicious (brownish/yellowish).
I also had some fungi infections in some of my plants in the past - but nothing similar to this.
I'm looking forward to reading your comments, as I'm really sorry for this plant.
Cheers,
Israel

 

Thanks Marni for correcting the link! You are all right - this is indeed sunburn. Since I never had that problem (in 8 years of growing orchids) I could not recognize it. But now it is obvious. And knowing what it is I also know what happened: I forgot to put the sunscreen during that day (it was raining all the time) and the sun probably came out for several hours before I came back. Well - this won't happen again...
I presume there's nothing I can do about it now, is there? Should i remove the damaged leaves (some 9 of them)? The plant seems further OK. I hope it recovers quickly. Any tips are welcome!

Tomuk, I grow this one hanging on my windowsill (facing the south;temp. 16-25 Celsius), dipping it in rainwater almost every day and fertilizing it once a week. In December or January I put it in a cold attic (2-10 Celsius) with some artificial light for 6-8 weeks with no watering except once in 3 weeks - then a very quick dip. In February/March I bring it back to the warmth of my living room and dip it as much as possible with lukewarm water. Usually three weeks later the flower spikes would appear.
I'm really happy it's 'just' sunburn and not something terrible like fungi attack or water poisoning.