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35,151 Research products, page 1 of 3,516

  • Rural Digital Europe
  • Open Access
  • Journal of Geophysical Research Atmospheres

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  • Open Access
    Authors: 
    Wen Li; Yuri Shprits; Richard M. Thorne;
    Publisher: American Geophysical Union (AGU)

    [1] Relativistic electrons in the outer radiation belt are subjected to pitch angle and energy diffusion by chorus, electromagnetic ion cyclotron (EMIC), and hiss waves. Using quasi-linear diffusion coefficients for cyclotron resonance with field-aligned waves, we exami...

  • Open Access
    Authors: 
    Lu Wang; Robert M. Moore; John J. Cullen;
    Publisher: American Geophysical Union (AGU)

    [1] While the global ocean is an important source of atmospheric methyl iodide (CH3I), the major producers of CH3I within the ocean remain unclear. During a seasonal study in the NW Atlantic, the relationship between CH3I and some characteristic phytoplankton pigments w...

  • Open Access
    Authors: 
    Yonghua Chen; James R. Miller; Jennifer A. Francis; Gary L. Russell; Filipe Aires;
    Publisher: American Geophysical Union (AGU)

    [1] The complex interactions among climate variables in the Arctic have important implications for potential climate change, both globally and locally. Because the Arctic is a data-sparse region and because global climate models (GCMs) often represent Arctic climate var...

  • Open Access
    Authors: 
    C. L. Waters; Murray Sciffer; Brian Fraser; Kate Brand; K. Foulkes; Frederick W. Menk; Osuke Saka; Kiyohumi Yumoto;
    Publisher: American Geophysical Union (AGU)

    Ultralow frequency (ULF) waves at the geomagnetic equator are studied by using a small magnetometer array and a one-dimensional electromagnetic wave model. Most ULF waves observed at low latitudes have been associated with shear Alfven mode hydromagnetic resonances in t...

  • Open Access
    Authors: 
    Robert Wright; Servando De la Cruz-Reyna; Andrew I. Harris; Luke P. Flynn; Juan Jose Gomez-Palacios;
    Publisher: American Geophysical Union (AGU)

    [1] Since December 1994, activity at Popocatepetl has evolved through two main phases. The first was characterized by elevated seismic activity, degassing, and emissions of predominantly lithic ash. However, in March 1996 the volcano entered a magmatic phase, which has ...

  • Publication . Article . 2006
    Open Access
    Authors: 
    Alejandro J. Souza; A.E. Hill;
    Publisher: American Geophysical Union (AGU)

    Intricate networks of tidal channels such as are found in fjordic, barrier island and branching estuarine systems are often at risk from contaminant inputs and can be important as spawning grounds or migration pathways for marine organisms. These intricate systems are r...

  • Open Access English
    Authors: 
    David Bercovici; Yanick Ricard; Gerald Schubert;
    Publisher: HAL CCSD
    Country: France

    cited By 174; International audience; A theoretical model for the dynamics of a simple two-phase mixture is presented. A classical averaging approach combined with symmetry arguments is used to derive the mass, momentum, and energy equations for the mixture. The theory ...

  • Open Access
    Authors: 
    Larry P. Atkinson; Thomas N. Lee; Jackson O. Blanton; William S. Chandler;
    Publisher: American Geophysical Union (AGU)

    Data from 2872 hydrographic stations have been used to determine the oceanographie climatology of the southeastern United States continental shelf waters. The data were sorted by each degree of latitude and by depth into three zones (0–20 m, 21–40 m, 41–60 m). Inner she...

  • Open Access
    Authors: 
    Dawn Y. Sumner;
    Publisher: American Geophysical Union (AGU)
    Country: United States

    [1] Life is composed of organic compounds, and characterizing preserved compounds provides insights into the presence of specific types of life, including early life on Earth. With growing evidence for a wet early Mars, excitement over the potential of an early Martian ...

  • Open Access
    Authors: 
    Ludger Scherliess; Robert W. Schunk; Jan Josef Sojka; Donald C. Thompson; Lie Zhu;
    Publisher: American Geophysical Union (AGU)
    Country: United States

    [1] The Utah State University Gauss-Markov Kalman Filter (GMKF) was developed as part of the Global Assimilation of Ionospheric Measurements (GAIM) program. The GMKF uses a physics-based model of the ionosphere and a Gauss-Markov Kalman filter as a basis for assimilatin...