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December 2014 BRAS Newsletter

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December 2014 BRAS Newsletter December, 2014 Next Meeting: December 8th at 7PM at the HRPO Artist rendition of the Philae lander from the ESA's Rosetta mission. Click on the picture to go see the latest info. What's In This Issue? Astro Short- Mercury: Snow Globe Dynamo? Secretary's Summary Message From HRPO Globe At Night Recent Forum Entries Orion Exploration Test Flight Event International Year of Light 20/20 Vision Campaign Observing Notes by John Nagle Mercury: Snow Globe Dynamo? We already knew Mercury was bizarre. A planet of extremes, during its day facing the sun, its surface temperature tops 800°F —hot enough to melt lead—but during the night, the temperature plunges to -270°F, way colder than dry ice. Frozen water may exist at its poles. And its day (from sunrise to sunrise) is twice as long as its year. Now add more weirdness measured by NASA’s recent MESSENGER spacecraft: Mercury’s magnetic field in its northern hemisphere is triple its strength in the southern hemisphere. Numerical models run by postdoctoral researcher Hao Cao, working in the lab of Christopher T. Russell at UC Los Angeles, offer an explanation: inside Mercury’s molten iron core it is “snowing,” and the resultant convection is so powerful it causes the planet’s magnetic dynamo to break symmetry and concentrate in one hemisphere. “Snowing” inside Mercury With a diameter only 40 percent greater than the Moon’s, Mercury is the smallest planet in the solar system (now that Pluto was demoted). But its gravitational field is more than double the Moon’s. Why? Mercury has an absolutely gigantic iron core, accounting for 85 percent of the planet’s radius—about the size of the entire Moon. Only the planet’s outermost 15 percent is a silicate mantle. Most of that iron is molten. Just the innermost core is solid: its size is unknown, but more on this in a bit. The molten iron is mixed with lighter elements, of which silicon and sulfur are most abundant. In 2008, other scientists showed that when iron is mixed with a lighter element under intense pressures likely reached partway inside Mercury’s molten core, there is a zone where solid iron will spontaneously precipitate in fine flakes like iron filings, drifting down like snow toward the solid core. At the same time, buoyant lighter elements will also separate from the iron as a liquid and will float upwards as fine droplets toward the mantle. Inside Mercury there may be two distinct “snow zones.” In both cases, as solid iron falls and the lighter elements rise, their convective action stirs this gigantic molten iron core, bending and stretching magnetic field lines, driving an energetic planetary dynamo. Planetary dynamos are thought to be helical (spiral) flows of a magnetized fluid along columns parallel to the planet’s axis of rotation; molten iron in the case of the rocky inner planets. A given column can spiral any of four combinations of directions: either clockwise or counterclockwise while flowing toward the poles or toward the equator. The question is what happens at the planet’s equator. Spin flip Inside Earth, in any single column both the northward and southward flows on both sides of the equator are spiraling in the same direction (say, clockwise and toward the equator). In a neighboring column, the flows all spiral in the opposite direction (say, counter-clockwise and toward the poles). That flow configuration is called an “even” mode. If convective stirring is much stronger than Earth’s, fluid mechanics predicts that a planet’s molten iron core can also host an “odd” mode where the section of each column south of the equator spins in the opposite direction from the section north of the equator —that is, they reverse vorticity at the equator. But the numerical simulations reveal that with really, really strong convective stirring —as would happen if a planet’s entire molten core is pervaded with convective iron snow—something dramatic happens: the odd and even modes overlap, spontaneously breaking symmetry and enhancing helicity in one hemisphere at the expense of the other. “Unlike the Earth’s dynamo…, Mercury’s dynamo is likely powered by uniformly distributed buoyancy sources within the liquid core,” the authors conclude. The model also predicts a size for Mercury’s inner core: small. In the simulations, a Mercury-like asymmetric magnetic field developed only when the solid inner core was less than half the radius of the molten outer core-mantle boundary. –Trudy E. Bell, M.A. Further reading: The paper by Cao and coauthors is “A dynamo explanation for Mercury’s anomalous magnetic field” in Geophysical Research Letters 41(2014):4127– 4134. A review article is “Model dynamo may solve Mercury mystery,” by Ashley G. Smart, in Physics Today (August 2014) pp. 14–16. See also UCLA press release “Mercury’s magnetic field tells scientists how its interior is different from Earth’s” at http://newsroom.ucla.edu/releases/mercury-s-magnetic-field-tells-scientists-how-its- interior-is-different-from-earth-s. The University of California High-Performance AstroComputing Center (UC-HIPACC), based at the University of California, Santa Cruz, is a consortium of nine University of California campuses and three affiliated Department of Energy laboratories (Lawrence Berkeley Lab, Lawrence Livermore Lab, and Los Alamos National Lab). UC-HiPACC fosters collaborations among researchers at the various sites by offering travel and other grants, co-sponsoring conferences, and drawing attention to the world-class resources for computational astronomy within the University of California system. More information appears at http://hipacc.ucsc.edu Mercury seen close-up from MESSENGER, with colors enhanced to emphasize the chemical, mineralogical, and physical differences among its surface rocks. Credit: NASA Secretary's Summary of November Meeting - It was announced that today was Ben Toman’s birthday. Cake will be served to all during the meeting. - Craig brought two 30-minute DVD’s; the club will vote on which one to watch this evening. The first one is an IMAX film entitled “Cosmic Voyage” with Morgan Freeman narrating; the second one is entitled “Cosmic Collisions” with Robert Redford narrating. The club voted for Cosmic Collisions. - Chris mentioned that the Orion capsule is going for its test run on December 4th. The marketing department at NASA sent the observatory a baseball cap and an XL T-shirt as we are one of the main venues for televising the launch. Merrill has a neighbor that has worked on this project; he will check with him to see if he wants to come and give a lecture sometime in the future. The cap and shirt will be raffle prizes at the end of the evening. - Someone was asking about the Leonid meteor shower next week. The fireball from Halloween night was noted. Chris Deselles talked about doing sidewalk astronomy Halloween night. - The AL Lunar Observing Award was presented to Chad Thibodeaux. Ben talked about the BRAS Lunar Certificate also. There are two AL outreach certificates and one more Messier certificate coming in the future. - Trey is taking dues for next year. The Astronomy calendars are in; you can pick yours up if you have ordered one or you can purchase one from him for $10. He also mentioned that you now have the ability to renew your Astronomy subscription online; see him for details. - While they were lighting up the birthday cake for Ben, it was announced that they were raffling off several books and that you could pick up two paperbacks for you winning raffle ticket. Everyone sang “Happy Birthday” to Ben, cake was served, and then we watched the “Cosmic Collisions” DVD. - The December meeting on the 8th is our annual Christmas potluck. There will be a raffle then at $5 a ticket for the Celestron 9.5 x 44 binoculars. These have a 6-degree field of view similar to Zeiss binoculars. These are roughly valued at $300 and are a donation from the late Art Newman. - The Rosetta mission having to do with rendezvousing with a comet was mentioned. They are taking lots of photographs. They moved the landing time up to the 12th. They are starting to broadcast this from the ESA. They will use harpoons to anchor the probe to the comet when it lands. There is more information at the ESA website. - A raffle was held and then all the BRAS-owned scopes and equipment was pulled out of the closet for evaluation. -Roslyn Readinger BRAS Secretary HRPO FRIDAY NIGHT LECTURE SERIES all start at 7:30pm 5 December: “Buying Your First Telescope” 12 December: “The Star of Bethlehem” 19 December: {no lecture} 26 December: {HRPO closed} SCIENCE ACADEMY Saturdays from 10am to 12pm For ages eight to twelve. $5/$6 per child. 6 December: “Venus” 13 December: “Expedition 5” 20 December: “Distance in Space” 27 December: “Temperature in Space” CALL FOR VOLUNTEERS *Thursday, 4 December. Two volunteers for three hours each. Orion First Test Flight. Small telescope. Easy. *Saturday, 13 December from 9pm to 1am. Two volunteers. Geminid Meteor Shower. Small telescope. Easy. *Friday, 19 December from 6pm to 10pm. Three volunteers. International Year of Light Preview Party. Various simple tasks; easy. *Saturday, 27 December from 12pm to 2pm. One volunteer in addition to regular BRAS complement. Solar Viewing. Marshmallow roast, demonstration tables; small telescope; setup and takedown. Easy; training provided. *Saturday, 3 January from 3pm to 7pm. Four or five volunteers. Learn Your Binocular. Instructing registrants in the use of their personal binoculars. Previous binocular knowledge required. *Saturday, 24 January from 3pm to 7pm. Eight or nine volunteers. Learn Your Telescope. Instructing registrants in the use of their personal telescopes.
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