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Special Ed
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High Altitude Cloud on Martian Limb
      #5135254 - 03/22/12 10:54 AM

Hi,

A very interesting phenomenon has been imaged on Mars. Look here for details.


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Asbytec
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Reged: 08/08/07

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Re: High Altitude Cloud on Martian Limb new [Re: Special Ed]
      #5135305 - 03/22/12 11:24 AM

Yea, that's very interesting. Seeing them on a different planet is cool. I see them here, on planet earth, tonight.

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Ed D
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Re: High Altitude Cloud on Martian Limb new [Re: Asbytec]
      #5136099 - 03/22/12 07:36 PM

WOW, that is really interesting.

Ed D


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tigerroach
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Reged: 08/13/08

Loc: Houston, TX USA
Re: High Altitude Cloud on Martian Limb new [Re: Ed D]
      #5136173 - 03/22/12 08:20 PM

Sweet!

Just waiting for the sun to go down... hopefully the high-altitude winds that destroyed the seeing from here last night will be gone.


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stanislas-jean
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Reged: 10/22/08

Re: High Altitude Cloud on Martian Limb new [Re: Special Ed]
      #5136620 - 03/23/12 03:13 AM Attachment (160 downloads)

Here is a sketch of mars performed last night with a 203mm.
A yellow cloud spreading as shown and a cloud seen at the limb (high altitude).
May be some others catched the event.
Stanislas-Jean


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Rich (RLTYS)Moderator
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Re: High Altitude Cloud on Martian Limb new [Re: Special Ed]
      #5136752 - 03/23/12 08:04 AM

That is so cool.

Rich (RLTYS)


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ggalilei
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Re: High Altitude Cloud on Martian Limb new [Re: Rich (RLTYS)]
      #5136994 - 03/23/12 11:40 AM

Interesting image, and great observing skills. I'm just beginning to learn, I can only see the brightening of the western limb.
Are they carbon dioxide clouds?


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stanislas-jean
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Re: High Altitude Cloud on Martian Limb new [Re: ggalilei]
      #5137155 - 03/23/12 01:24 PM

They are presently white clouds on the equator area made of materials coming from the thawing of the polar cap. These brightenings in fact are a mist (dust and hazze majorily) staying for the most at the limb and terminator. They are called white clouds.
Now recently was viewd a yellow cloud on noachis pandorae fretum area with an altitude cloud. This was first reported in US by MMr Parker Don and Mark Philips may be 2 days before, but not on the same area as shown on the sketch.
This is a big event that may be greater in activity with time.
Stanislas-Jean


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David Knisely
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Re: High Altitude Cloud on Martian Limb new [Re: stanislas-jean]
      #5137226 - 03/23/12 01:58 PM

Quote:

They are presently white clouds on the equator area made of materials coming from the thawing of the polar cap. These brightenings in fact are a mist (dust and hazze majorily) staying for the most at the limb and terminator. They are called white clouds.
Now recently was viewd a yellow cloud on noachis pandorae fretum area with an altitude cloud. This was first reported in US by MMr Parker Don and Mark Philips may be 2 days before, but not on the same area as shown on the sketch.
This is a big event that may be greater in activity with time.
Stanislas-Jean




No, the clouds closer to the equator are mainly either morning hazes or orographic clouds that form as the martian atmosphere is forced upwards by high topographic features such as the martian volcanoes in Tharsis. Most of the brighter white clouds are orographic in nature with the more prominent ones forming over areas like Olympus Mons or the other Tharsis shields. The southern limb clouds currently are the polar hazes, but the ones over the equator are not. Clear skies to you.


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David Knisely
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Re: High Altitude Cloud on Martian Limb new [Re: ggalilei]
      #5137234 - 03/23/12 02:02 PM

Quote:

Interesting image, and great observing skills. I'm just beginning to learn, I can only see the brightening of the western limb.
Are they carbon dioxide clouds?




Some may be, but others are high altitude water ice clouds. Clear skies to you.


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Special Ed
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Re: High Altitude Cloud on Martian Limb new [Re: stanislas-jean]
      #5137350 - 03/23/12 03:18 PM

Stanislas,

A very nice set of sketches showing the Meridiani/Erythraeum/Acidalium albedo features as well as the multitude of clouds visible around the Martian disk.

Quote:

Now recently was viewd a yellow cloud on noachis pandorae fretum area with an altitude cloud. This was first reported in US by MMr Parker Don and Mark Philips may be 2 days before, but not on the same area as shown on the sketch.
This is a big event that may be greater in activity with time.
Stanislas-Jean




This is the cloud that I referred to in my original post and provided the link to imagery by Wayne Jaeschke. Don Parker has an excellent image posted on the Yahoo Mars Observers website but I think you have to be a member of the group to view it (for those out there who would like to see it).

Some estimates put this cloud rising to an altitude of 250 km (160 miles). Some people liken it to a plume rather than a cloud (like a volcanic plume). There is some speculation that the origin of the cloud/plume could be the impact of a large body into the Martian surface. That's not fetched that far--there have been plenty of impacts on Mars in the past. Others feel that it is an illusion of lighting and imagery artifacts on the terminator.

Edited by Special Ed (03/23/12 03:23 PM)


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WayneJ
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Re: High Altitude Cloud on Martian Limb new [Re: Special Ed]
      #5137888 - 03/23/12 09:23 PM

Hi all,

Just an FYI that the phenomena on Mars was mentioned in a story on MSNBC today. Cloudy Nights was mentioned (with a link to this thread!)

Mysterious cloud spotted on Mars

Regards,

Wayne


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Scanning4Comets
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Loc: Ontario, Canada
Re: High Altitude Cloud on Martian Limb new [Re: WayneJ]
      #5138212 - 03/24/12 01:53 AM

Velly Intalesting ! I seen it on the 19th, but just figured it was some dark marking I didn't know about, as I am not familiar with the Martian markings and their names.

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stanislas-jean
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Reged: 10/22/08

Re: High Altitude Cloud on Martian Limb new [Re: Special Ed]
      #5138646 - 03/24/12 10:48 AM Attachment (100 downloads)

I did a second observation of Mars yesterday night with the same scope and the 305mm to see if something change also.

1st thing, this appeared less conspiscious than the day before but what happened was this bright dot at the limb brighter than the yellow patch that was a stretched band appearnce in red color.

2nd thing, the bright dot at the limb involved me a confusion sothat some high altitude cloud was expected in the 200mm. Some glare effect due to the brightness of the dot at the limb. This was not seen at the 305mm at the same period time.

Globally what was seen yesterday was less strong than the day before, the overall size of the yellow patch less contrasty in intensity and size.
People at japanese CMO body said this could be more an aurorae than clouds itselves. Personnally I don't know but this is strange to see. I think globally this opposition more cloudy and hazzy with the cap thawing processus. May be something in relation.
The sketches of yesterday night here.
These last observations here doesnot put on question the observations above of the before yesterday night.

I am BAA member Mark, and CN forum participating, interresting here for some exchanges.
Stanislas-Jean


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contrailmaker
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Reged: 01/02/09

Re: High Altitude Cloud on Martian Limb new [Re: stanislas-jean]
      #5139198 - 03/24/12 04:11 PM

Very nice sketches Stanislas. I've had no luck seeing the projection with my 152mm refractor. Will try again tonight.

cm


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Shadowalker
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Re: High Altitude Cloud on Martian Limb new [Re: contrailmaker]
      #5139486 - 03/24/12 07:57 PM

Hey, You guys got a mention on MSNBC. Good work!

http://cosmiclog.msnbc.msn.com/_news/2012/03/23/10831821-mysterious-cloud-spotted-on-mars


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Glassthrower
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Re: High Altitude Cloud on Martian Limb new [Re: Shadowalker]
      #5141231 - 03/25/12 09:19 PM

I'm still following the story on this cloud formation. Have they definitively put forth an explanation yet? And did you guys see anything new since? I've had a couple clear nights lately, but can't get the time to do any quality observing.

Best regards and clear skies,

MikeG


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