Seasonal variations in Mercury’s dayside calcium exosphere
•MESSENGER has observed Mercury’s exospheric Ca for eight Mercury years.•There is a persistent source of energetic Ca in Mercury’s dawn equatorial region.•There is a seasonal, but not year-to-year variation in the Ca source rate. The Mercury Atmospheric and Surface Composition Spectrometer on the ME...
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| Veröffentlicht in: | Icarus (New York, N.Y. 1962) N.Y. 1962), 2014-08, Vol.238, p.51-58 |
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| container_title | Icarus (New York, N.Y. 1962) |
| container_volume | 238 |
| creator | Burger, Matthew H. Killen, Rosemary M. McClintock, William E. Merkel, Aimee W. Vervack, Ronald J. Cassidy, Timothy A. Sarantos, Menelaos |
| description | •MESSENGER has observed Mercury’s exospheric Ca for eight Mercury years.•There is a persistent source of energetic Ca in Mercury’s dawn equatorial region.•There is a seasonal, but not year-to-year variation in the Ca source rate.
The Mercury Atmospheric and Surface Composition Spectrometer on the MESSENGER spacecraft has observed calcium emission in Mercury’s exosphere on a near-daily basis since March 2011. During MESSENGER’s primary and first extended missions (March 2011 – March 2013) the dayside calcium exosphere was measured over eight Mercury years. We have simulated these data with a Monte Carlo model of exospheric source processes to show that (a) there is a persistent source of energetic calcium located in the dawn equatorial region, (b) there is a seasonal dependence in the calcium source rate, and (c) there are no obvious year-to-year variations in the near-surface dayside calcium exosphere. |
| doi_str_mv | 10.1016/j.icarus.2014.04.049 |
| format | Article |
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The Mercury Atmospheric and Surface Composition Spectrometer on the MESSENGER spacecraft has observed calcium emission in Mercury’s exosphere on a near-daily basis since March 2011. During MESSENGER’s primary and first extended missions (March 2011 – March 2013) the dayside calcium exosphere was measured over eight Mercury years. We have simulated these data with a Monte Carlo model of exospheric source processes to show that (a) there is a persistent source of energetic calcium located in the dawn equatorial region, (b) there is a seasonal dependence in the calcium source rate, and (c) there are no obvious year-to-year variations in the near-surface dayside calcium exosphere.</description><subject>Atmospheres, structure</subject><subject>Calcium</subject><subject>Computer simulation</subject><subject>Equatorial regions</subject><subject>Exosphere</subject><subject>Mercury</subject><subject>Mercury (planet)</subject><subject>Mercury surface</subject><subject>Mercury, atmosphere</subject><subject>MESSENGER Spacecraft</subject><subject>Seasonal variations</subject><subject>Spectroscopy</subject><issn>0019-1035</issn><issn>1090-2643</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNqNkM9KxDAQxoMouK6-gYcevbTOJG3agAiy-A9WPKjnkE2nmKXbrkkr7s3X8PV8ElvqWYQPBobffMz3MXaKkCCgPF8nzhrfh4QDpgmMUntshqAg5jIV-2wGgCpGENkhOwphDQBZocSMXTyRCW1j6ujdeGc61zYhck30QN72fvf9-RWi0uyCKymyprau30T00YbtK3k6ZgeVqQOd_M45e7m5fl7cxcvH2_vF1TI2qcQulgUWCCtjqhLzQipALqHkKeUceVWSFFUGw0ZgZo1cCVzluUDLVYaSTKXEnJ1NvlvfvvUUOr1xwVJdm4baPmiUEkCKrBD_QHmu8mxwHtB0Qq1vQ_BU6a13G-N3GkGPveq1nnrVY68aRo3PXE5nNCR-d-R1sI4aS6XzZDtdtu5vgx-BJ4KX</recordid><startdate>20140801</startdate><enddate>20140801</enddate><creator>Burger, Matthew H.</creator><creator>Killen, Rosemary M.</creator><creator>McClintock, William E.</creator><creator>Merkel, Aimee W.</creator><creator>Vervack, Ronald J.</creator><creator>Cassidy, Timothy A.</creator><creator>Sarantos, Menelaos</creator><general>Elsevier Inc</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20140801</creationdate><title>Seasonal variations in Mercury’s dayside calcium exosphere</title><author>Burger, Matthew H. ; Killen, Rosemary M. ; McClintock, William E. ; Merkel, Aimee W. ; Vervack, Ronald J. ; Cassidy, Timothy A. ; Sarantos, Menelaos</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a461t-681810baafd1786901260d24e7212fde63f5060d315ca6b31b7731c29516eaf93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Atmospheres, structure</topic><topic>Calcium</topic><topic>Computer simulation</topic><topic>Equatorial regions</topic><topic>Exosphere</topic><topic>Mercury</topic><topic>Mercury (planet)</topic><topic>Mercury surface</topic><topic>Mercury, atmosphere</topic><topic>MESSENGER Spacecraft</topic><topic>Seasonal variations</topic><topic>Spectroscopy</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Burger, Matthew H.</creatorcontrib><creatorcontrib>Killen, Rosemary M.</creatorcontrib><creatorcontrib>McClintock, William E.</creatorcontrib><creatorcontrib>Merkel, Aimee W.</creatorcontrib><creatorcontrib>Vervack, Ronald J.</creatorcontrib><creatorcontrib>Cassidy, Timothy A.</creatorcontrib><creatorcontrib>Sarantos, Menelaos</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Icarus (New York, N.Y. 1962)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Burger, Matthew H.</au><au>Killen, Rosemary M.</au><au>McClintock, William E.</au><au>Merkel, Aimee W.</au><au>Vervack, Ronald J.</au><au>Cassidy, Timothy A.</au><au>Sarantos, Menelaos</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Seasonal variations in Mercury’s dayside calcium exosphere</atitle><jtitle>Icarus (New York, N.Y. 1962)</jtitle><date>2014-08-01</date><risdate>2014</risdate><volume>238</volume><spage>51</spage><epage>58</epage><pages>51-58</pages><issn>0019-1035</issn><eissn>1090-2643</eissn><abstract>•MESSENGER has observed Mercury’s exospheric Ca for eight Mercury years.•There is a persistent source of energetic Ca in Mercury’s dawn equatorial region.•There is a seasonal, but not year-to-year variation in the Ca source rate.
The Mercury Atmospheric and Surface Composition Spectrometer on the MESSENGER spacecraft has observed calcium emission in Mercury’s exosphere on a near-daily basis since March 2011. During MESSENGER’s primary and first extended missions (March 2011 – March 2013) the dayside calcium exosphere was measured over eight Mercury years. We have simulated these data with a Monte Carlo model of exospheric source processes to show that (a) there is a persistent source of energetic calcium located in the dawn equatorial region, (b) there is a seasonal dependence in the calcium source rate, and (c) there are no obvious year-to-year variations in the near-surface dayside calcium exosphere.</abstract><pub>Elsevier Inc</pub><doi>10.1016/j.icarus.2014.04.049</doi><tpages>8</tpages></addata></record> |
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| ispartof | Icarus (New York, N.Y. 1962), 2014-08, Vol.238, p.51-58 |
| issn | 0019-1035 1090-2643 |
| language | eng |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Atmospheres, structure Calcium Computer simulation Equatorial regions Exosphere Mercury Mercury (planet) Mercury surface Mercury, atmosphere MESSENGER Spacecraft Seasonal variations Spectroscopy |
| title | Seasonal variations in Mercury’s dayside calcium exosphere |
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