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  • Geophysics  (3)
  • Humans  (2)
  • 01. Atmosphere::01.03. Magnetosphere::01.03.01. Interplanetary physics  (1)
  • 2020-2024
  • 2005-2009  (5)
  • 2000-2004  (1)
  • 1955-1959
  • 1935-1939
  • 1
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    Micromagnetic coercivity distributions and interactions in chondrules with implications for paleointensities of the early solar system (2007)
    American Geophysical Union
    Details
    Publication Date: 2017-04-04
    Description: Chondrules in chondritic meteorites record the earliest stages of formation of the solar system, potentially providing information about the magnitude of early magnetic fields and early physical and chemical conditions. Using first-order reversal curves (FORCs), we map the coercivity distributions and interactions of 32 chondrules from the Allende, Karoonda, and Bjurbole meteorites. Distinctly different distributions and interactions exist for the three meteorites. The coercivity distributions are lognormal shaped, with Bjurbole distributions being bimodal or trimodal. The highest-coercivity mode in the Bjurbole chondrules is derived from tetrataenite, which interacts strongly with the lower-coercivity grains in a manner unlike that seen in terrestrial rocks. Such strong interactions have the potential to bias paleointensity estimates. Moreover, because a significant portion of the coercivity distributions for most of the chondrules is 〈10 mT, low-coercivity magnetic overprints are common. Therefore paleointensities based on the REM method, which rely on ratios of the natural remanent magnetization (NRM) to the saturation isothermal remanent magnetization (IRM) without magnetic cleaning, will probably be biased. The paleointensity bias is found to be about an order of magnitude for most chondrules with low-coercivity overprints. Paleointensity estimates based on a method we call REMc, which uses NRM/IRM ratios after magnetic cleaning, avoid this overprinting bias. Allende chondrules, which are the most pristine and possibly record the paleofield of the early solar system, have a mean REMc paleointensity of 10.4 μT. Karoonda and Bjurbole chondrules, which have experienced some thermal alteration, have REMc paleointensities of 4.6 and 3.2 μT, respectively.
    Description: NSF and INGV
    Description: Published
    Description: B03S90
    Description: 2.2. Laboratorio di paleomagnetismo
    Description: JCR Journal
    Description: reserved
    Keywords: paleomagnetism coercivity ; paleointensity ; magnetic interactions ; meteorite ; Chondrules ; FORC diagrams ; 01. Atmosphere::01.03. Magnetosphere::01.03.01. Interplanetary physics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Careers in science. More women in science (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-08-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Handelsman, Jo -- Cantor, Nancy -- Carnes, Molly -- Denton, Denice -- Fine, Eve -- Grosz, Barbara -- Hinshaw, Virginia -- Marrett, Cora -- Rosser, Sue -- Shalala, Donna -- Sheridan, Jennifer -- New York, N.Y. -- Science. 2005 Aug 19;309(5738):1190-1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Pathology, University of Wisconsin - Madison, 1630 Linden Dr., Madison, WI 53706, USA. joh@ plantpath.wisc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16109868" target="_blank"〉PubMed〈/a〉
    Keywords: Career Choice ; *Career Mobility ; Education, Graduate ; *Faculty ; Family ; Female ; Humans ; Personnel Selection ; Prejudice ; *Science ; Universities ; *Women
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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    PAPER CURRENT
  • 3
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    Gender differences and performance in science (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-02-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Muller, Carol B -- Ride, Sally M -- Fouke, Janie -- Whitney, Telle -- Denton, Denice D -- Cantor, Nancy -- Nelson, Donna J -- Plummer, Jim -- Busch-Vishniac, Ilene -- Meyers, Carolyn -- Rosser, Sue V -- Schiebinger, Londa -- Roberts, Eric -- Burgess, David -- Beeson, Craig -- Metz, Susan Staffin -- Sanders, Lucinda -- Watford, Bevlee A -- Ivey, Elizabeth S -- Frank Fox, Mary -- Wettack, Sheldon -- Klawe, Maria -- Wulf, William A -- Girgus, Joan -- Leboy, Phoebe S -- Babco, Eleanor L -- Shanahan, Betty -- Didion, Catherine -- Chubin, Daryl E -- Frize, Monique -- Ganter, Susan L -- Nalley, E Ann -- Franz, Judy -- Abruna, Hector D -- Strober, Myra H -- Zimmer Daniels, Jane -- Carter, Emily A -- Rhodes, Jean H -- Schrijver, Iris -- Zakian, Virginia A -- Simons, Barbara -- Martin, Ursula -- Boaler, Jo -- Jolluck, Katherine Rose -- Mankekar, Purnima -- Gray, Robert M -- Conkey, Margaret W -- Stansky, Peter -- Xie, Aihua -- Martin, Pino -- Katehi, Linda P B -- Miller, Jo Anne -- Tess Thornton, Amelia -- Lapaugh, Andrea -- Rhode, Deborah L -- Gelpi, Barbara C -- Harrold, Mary Jean -- Spencer, Cherrill M -- Schlatter Ellis, Carla -- Lord, Susan -- Quinn, Helen -- Murnane, Margaret -- Jones, Patricia P -- Hellman, Frances -- Wight, Gail -- O'hara, Ruth -- Pickering, Mary -- Sheppard, Sheri -- Leith, David -- Paytan, Adina -- Sommer, Matthew H -- Shafer, Audrey -- Grusky, David -- Yennello, Sherry -- Madan, Ashima -- Johnson, Denise L -- Yanagisako, Sylvia -- Chou-Green, Jennifer M -- Robinson, Sandra -- New York, N.Y. -- Science. 2005 Feb 18;307(5712):1043.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15718449" target="_blank"〉PubMed〈/a〉
    Keywords: *Career Choice ; Female ; Humans ; Male ; *Science ; *Sex Characteristics ; Social Change
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Analyzing Electric Field Morphology Through Data-Model Comparisons of the GEM IM/S Assessment Challenge Events (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The storm-time inner magnetospheric electric field morphology and dynamics are assessed by comparing numerical modeling results of the plasmasphere and ring current with many in situ and remote sensing data sets. Two magnetic storms are analyzed, April 22,2001 and October 21-23,2001, which are the events selected for the Geospace Environment Modeling (GEM) Inner Magnetosphere/Storms (IM/S) Assessment Challenge (IMSAC). The IMSAC seeks to quantify the accuracy of inner magnetospheric models as well as synthesize our understanding of this region. For each storm, the ring current-atmosphere interaction model (RAM) and the dynamic global core plasma model (DGCPM) were run together with various settings for the large-scale convection electric field and the nightside ionospheric conductance. DGCPM plasmaspheric parameters were compared with IMAGE-EUV plasmapause extractions and LANL-MPA plume locations and velocities. RAM parameters were compared with Dst*, LANL-MPA fluxes and moments, IMAGE-MENA images, and IMAGE-HENA images. Both qualitative and quantitative comparisons were made to determine the electric field morphology that allows the model results to best fit the plasma data at various times during these events. The simulations with self-consistent electric fields were, in general, better than those with prescribed field choices. This indicates that the time-dependent modulation of the inner magnetospheric electric fields by the nightside ionosphere is quite significant for accurate determination of these fields (and their effects). It was determined that a shielded Volland-Stern field description driven by the 3-hour Kp index yields accurate results much of the time, but can be quite inconsistent. The modified Mcllwain field description clearly lagged in overall accuracy compared to the other fields, but matched some data sets (like Dst*) quite well. The rankings between the simulations varied depending on the storm and the individual data sets, indicating that each field description did well for some place, time, and energy range during the events, as well as doing less well in other places, times, and energies. Several unresolved issues regarding the storm-time inner magnetospheric electric field are discussed.
    Keywords: Geophysics
    Format: text
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  • 5
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    Mineralogy and Petrology of COMET WILD2 Nucleus Samples (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The sample return capsule of the Stardust spacecraft will be recovered in northern Utah on January 15, 2006, and under nominal conditions it will be delivered to the new Stardust Curation Laboratory at the Johnson Space Center two days later. Within the first week we plan to begin the harvesting of aerogel cells, and the comet nucleus samples they contain for detailed analysis. By the time of the LPSC meeting we will have been analyzing selected removed grains for more than one month. This presentation will present the first results from the mineralogical and petrological analyses that will have been performed.
    Keywords: Geophysics
    Type: Ipsc; Mar 11, 2006 - Mar 17, 2006; Houston, TX; United States
    Format: application/pdf
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  • 6
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    A Modeling Study of the Latitudinal Variations in the Nighttime Plasma Temperatures of the Equatorial Topside Ionosphere During Northern Winter at Solar Maximum (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Latitudinal variations in the nighttime plasma temperatures of the equatorial topside ionosphere during northern winter at solar maximum have been examined by using values modelled by SUPIM (Sheffield University Plasmasphere Ionosphere Model) and observations made by the DMSP F10 satellite at 21.00 LT near 800 km altitude. The modelled values confirm that the crests observed near 15 deg latitude in the winter hemisphere are due to adiabatic heating and the troughs observed near the magnetic equator are due to adiabatic cooling as plasma is transported along the magnetic field lines from the summer hemisphere to the winter hemisphere. The modelled values also confirm that the interhemispheric plasma transport needed to produce the required adiabatic heating/cooling can be induced by F-region neutral winds. It is shown that the longitudinal variations in the observed troughs and crests arise mainly from the longitudinal variations in the magnetic meridional wind. At longitudes where the magnetic declination angle is positive the eastward geographic zonal wind combines with the northward (summer hemisphere to winter hemisphere) geographic meridional wind to enhance the northward magnetic meridional wind. This leads to deeper troughs and enhanced crests. At longitudes where the magnetic declination angle is negative the eastward geographic zonal wind opposes the northward geographic meridional wind and the trough depth and crest values are reduced. The characteristic features of the troughs and crests depend, in a complicated manner, on the field-aligned flow of plasma, thermal conduction, and inter-gas heat transfer. At the latitudes of the troughs/crests, the low/high plasma temperatures lead to increased/decreased plasma concentrations.
    Keywords: Geophysics
    Type: Annales Geophysicae; 18; 1435-1446
    Format: text
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