Author Topic: Particle Strike Collection  (Read 66912 times)

ElisabethB

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Particle Strike Collection
« on: January 17, 2010, 07:10:10 pm »
The Mods agreed it would be a good idea to have all the particle strike posts together as they have prompted some good and useful discussions. Please bear with us while we organise this!

Particle strikes are easily identified, but sometimes I see a faint trail in just one frame.
Is this a particle strike or 'something else' ?
« Last Edit: March 16, 2010, 10:52:53 am by jules »

ChrisScott

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Re: Particle Strike Collection
« Reply #1 on: January 17, 2010, 07:53:52 pm »
Particle strikes are easily identified, but sometimes I see a faint trail in just one frame.
Is this a particle strike or 'something else' ?


Crikey, that was well spotted! Yes, I think that it's likely to be a particle strike because it is not aligned with the other solar wind features. This sort of trail is indicative of debris moving past the spacecraft (it looks like a streak in the HI cameras because of our 40 minute exposure time). Not very spectacular on this occasion but if anything, that makes it even more interesting.

Thanks!

Chris.

ElisabethB

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Re: Particle Strike Collection
« Reply #2 on: January 17, 2010, 09:12:26 pm »
Thanks Chris. I thought these trails were particle strikes, but I wasn't sure.
These faint ones are relatively common (IMHO)  :D

ChrisScott

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Re: Particle Strike Collection
« Reply #3 on: January 17, 2010, 09:22:05 pm »
Thanks Chris. I thought these trails were particle strikes, but I wasn't sure.
These faint ones are relatively common (IMHO)  :D

Hmmm, maybe we need do need to categorise them separately then.
Can you define 'relatively common'? Do you see at least one in every video for example?

Thanks!

Chris.

ElisabethB

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Re: Particle Strike Collection
« Reply #4 on: January 17, 2010, 09:25:04 pm »
Not in every video, but at least one in three videos has these faint trails.
(don't shoot me, if it's one in four  :D)

ElisabethB

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Re: Particle Strike Collection
« Reply #5 on: January 17, 2010, 09:51:57 pm »
I did a quick test and watched 20 videos.
Out of these 20 videos, 4 had bright particle strikes and 9 had faint ones. There even was one video with 1 very bright one and 4 (!) faint ones.
relatively common ? I should think so !  :D

jules

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Re: Particle Strike Collection
« Reply #6 on: January 17, 2010, 10:22:00 pm »
Yes I've also noticed some videos look as if they have had a single particle strike. Hard to tell from a single frame but in this example the bright line in the centre heading for the bottom left corner is there for only this frame and is not aligned with the rest of the storm. Is this one of your bright single particles Els?

« Last Edit: March 16, 2010, 10:37:33 am by jules »

ElisabethB

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Re: Particle Strike Collection
« Reply #7 on: January 17, 2010, 10:31:29 pm »
I wouldn't call it bright but there is definitely something there.
I'd go for the 'not so bright/actually very fuzzy' particle strike button   ;D

jules

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Re: Particle Strike Collection
« Reply #8 on: January 17, 2010, 10:48:08 pm »
Consider it pressed. ;) Here's a couple more, both from the same video for the "Quite faint but definitely there for a single frame" button. :)


« Last Edit: March 16, 2010, 10:39:01 am by jules »

ElisabethB

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Re: Particle Strike Collection
« Reply #9 on: January 17, 2010, 10:54:57 pm »
top one, definitely faint
bottom one : I don't know, maybe I'd go for the regular particle strike button.  ;)
But it should really be included in the tutorial, that particle strikes can look very strange and fluffy/fuzzy indeed.

ChrisScott

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Re: Particle Strike Collection
« Reply #10 on: January 17, 2010, 11:32:56 pm »
Blimey, this is only the beta, you're not supposed to be discovering completely unexpected things *yet*! :o

There is evidence from the other instruments on the spacecraft that we undergo many more hits than had been expected but it looks like we image them much more often than we thought too. This is great stuff!

I agree, the training ought to reflect this and the examples you have given are just the ticket. I'll talk to the team about how we include them.

Excellent stuff!

Chris.

jules

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Re: Particle Strike Collection
« Reply #11 on: January 17, 2010, 11:38:32 pm »
top one, definitely faint
bottom one : I don't know, maybe I'd go for the regular particle strike button.  ;)
But it should really be included in the tutorial, that particle strikes can look very strange and fluffy/fuzzy indeed.
Yep - I agree Els. In fact I would miss some if I didn't use the forward button to advance frame by frame. Though it's surprising how easy it is to get your "eye in" after finding a few faint and fuzzy strikes.

Thanks for the feedback Chris. Is it useful to store / post the pictures?

Alice

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Re: Particle Strike Collection
« Reply #12 on: January 18, 2010, 01:33:49 am »
Hi Chris, you can't let anything loose on zooites like Jules and Els without them finding a lot of useful stuff! ;D

ChrisScott

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Re: Particle Strike Collection
« Reply #13 on: January 18, 2010, 09:42:01 am »
top one, definitely faint
bottom one : I don't know, maybe I'd go for the regular particle strike button.  ;)
But it should really be included in the tutorial, that particle strikes can look very strange and fluffy/fuzzy indeed.
Yep - I agree Els. In fact I would miss some if I didn't use the forward button to advance frame by frame. Though it's surprising how easy it is to get your "eye in" after finding a few faint and fuzzy strikes.

Thanks for the feedback Chris. Is it useful to store / post the pictures?

The ones you have posted are very useful but don't feel obliged to post all examples you find if they really are that common! Perhaps post any unusual examples you find so that we have a varied selection for the training.


Thanks!

Chris.

ChrisScott

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Re: Particle Strike Collection
« Reply #14 on: January 18, 2010, 09:47:18 am »
Hi Chris, you can't let anything loose on zooites like Jules and Els without them finding a lot of useful stuff! ;D

Hi Alice.

The tenacity and enthusiasm of zooites is the main reason why I wanted to show all of you our data but even knowing that, I'm constantly amazed at the power of the Zooniverse.

It's a pleasure to be here :)

Chris.