MRO spies gigantic dust devils in the summit calderas of Arsia Mons & Olympus Mons.

[3488]

<p><strong><font size="3">MRO spies gigantic dust devils in the summit calderas of Arsia Mons & Olympus Mons.</font></strong></p><p><font size="2"><strong>Incredible when it's worth mentioning that the atmospheric pressure at these altitudes above the Martian Aeroid, is only 0.6 Millibar or 1,668 times less dense than Earth's atmosphere is at sea level, or some 65 KM / 40 miles above Earth's sea level.</strong></font></p><strong><font size="3">Also large dust storm passing over Noctis Labyrinthus.</font></strong><p><font size="2"><strong>Andrew Brown. <br /></strong></font></p> <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[michaelmozina]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>MRO spies gigantic dust devils in the summit calderas of Arsia Mons & Olympus Mons.Incredible when it's worth mentioning that the atmospheric pressure at these altitudes above the Martian Aeroid, is only 0.6 Millibar or 1,668 times less dense than Earth's atmosphere is at sea level, or some 65 KM / 40 miles above Earth's sea level.Also large dust storm passing over Noctis Labyrinthus.Andrew Brown. <br /> Posted by 3488</DIV></p><p>It seems increadible to me that such things can form in such a thin atmosphere.&nbsp; Thanks for the links. </p> <div class="Discussion_UserSignature"> It seems to be a natural consequence of our points of view to assume that the whole of space is filled with electrons and flying electric ions of all kinds. - Kristian Birkeland </div>

 

[dragon04]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>MRO spies gigantic dust devils in the summit calderas of Arsia Mons & Olympus Mons.Incredible when it's worth mentioning that the atmospheric pressure at these altitudes above the Martian Aeroid, is only 0.6 Millibar or 1,668 times less dense than Earth's atmosphere is at sea level, or some 65 KM / 40 miles above Earth's sea level.Also large dust storm passing over Noctis Labyrinthus.Andrew Brown. <br /> Posted by 3488</DIV></p><p>Calling those two MONSTERS "Dust Devils" is kind of like referring to Moby Dick as a "big fish". WOW.. The cyclone on the 90km reference image is about 10 miles across. </p> <div class="Discussion_UserSignature"> <em>"2012.. Year of the Dragon!! Get on the Dragon Wagon!".</em> </div>

 

[exoscientist]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>MRO spies gigantic dust devils in the summit calderas of Arsia Mons & Olympus Mons.Incredible when it's worth mentioning that the atmospheric pressure at these altitudes above the Martian Aeroid, is only 0.6 Millibar or 1,668 times less dense than Earth's atmosphere is at sea level, or some 65 KM / 40 miles above Earth's sea level.Also large dust storm passing over Noctis Labyrinthus.Andrew Brown. <br />Posted by 3488</DIV><br /><br />&nbsp;Thanks for the links. One theory holds large dust storms on Mars arise from sublimation/evaporation of ice on the surface: </p><p>Title: Remote sensing evidence for regolith water vapor sources on Mars <br />Authors: <strong style="color:black;background-color:#ffff66">Huguenin</strong>, R. L.; Clifford, S. M. <br />Journal: (International Colloquium on Mars, 3rd: Dedicated to Thomas A. <br />Mutch /1931-1980/, Pasadena, CA, Aug. 30-Sept. 2, 1982.) Journal of <br />Geophysical Research, vol. 87, Nov. 30, 1982, p. 10227-10251 <br />"McCord et al. (1977) have presented earth-based photometric imaging data of <br />an event associated with the 1973 dust storm on Mars. The initial dust cloud <br />in Solis Lacus and two regions to the north and south appeared anomalously <br />bright at blue wavelengths. Water frosts, hazes, and/or clouds were <br />identified, and it was suggested that the water responsible for these <br />findings may have originated from Solis Lacus. More recently, a more <br />intensive review of the observational record of Mars was undertaken. <br />Earth-based telescope observations and data from the Mariner and Viking <br />missions have revealed that Solis Lacus has been a center of repeated <br />activity. Persistent activity in the vicinity of Noachis-Hellespontus and in <br />the border regions of Syrtis Major was also discovered. A review of the <br />observations is provided and possible interpretations are discussed. The <br />obtained results appear to support the original proposal that Solis Lacus <br />may be a source of water vapor. Noachis-Hellespontus seems to be a similar <br />vapor source." <br />http://adsabs.harvard.edu/cgi-bin/bib_query?1982JGR....8710227H [abstract] </p><p>&nbsp;Recent observations show large ice deposits at or near surface in Arsia Mons, Olympic Mons and Noctis Labyrinthus.</p><p>&nbsp;&nbsp; Bob Clark</p><p>&nbsp;</p> <div class="Discussion_UserSignature"> </div>

 

[MeteorWayne]

<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>&nbsp;<br />Posted by exoscientist</DIV></p><p>Rather an old article to be bringing up, eh? Has there been any advacement in our knowledge about Mars in the last quarter century? (Hint...the answer is YES&nbsp;<img src="http://sitelife.space.com/ver1.0/content/scripts/tinymce/plugins/emotions/images/smiley-laughing.gif" border="0" alt="Laughing" title="Laughing" /> )</p> <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>