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Articles

1. Modulation of Saturn's radio clock by solar wind speed 2007

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwjV3db9MwELfoJiRegA0E3aBYaBIgkdWp7diWxqQ2tHSMjqotMPES5ZMipHZaNtD-e-6cpGullfFyrduLZesud2f7_DtC9kLwiUJz19Gw1HEESNhB2CwnxpR3Di42TcXqZg55W92FKeVbmUVrq5N5jNvkTVhvexC-ixrZBKckUIc7Xf86ocPFSKY8QBCCqWUA5vJqHuO6WSBmMvD7asUZlSa5NsWMyFVczRviTut_eg_IaTVym3aCxQ6W8--bFvPQAl1U-I7_O8uH5H4Zk9J2oURb5E462yZ3iyqVV_DNZonG-TbZKi1BTl-XcNVvHpF3g3lS1gCj84yOcUazVzk9mB6eh8nPOY3BX_46aE4PaXRFc1xK0z8wYJqfged8TL70uhO_75RFGRwQq3vhSMPizE29iEUy5sqEkmeslYqMhToEfdBJliZxzD0dZlyETLJWpmSSurEMvUQp_pTQTBsZuTJlOkxEJrxQxlESGbwUDAGsSetkrxJLcFaAbgT2sJzrYEl6wIYiCxDGYoZ5Mj_CyzwP2pNv_knQdrVREI9yfgub4UIpqaC3lzexHY1HK339g2mpJ9ChxcgRwLvf_hTgb4wr7UnDf7t1slNMZcG3MrPdSjeC0qbkARYO8JjyRJ28WPwLxgBPeMJZOr_Mg0p31nNgOQTlKbOew9OwCIZVbp3QNRwQdLaMMlLWyZPilbiWkjJGMNPauXWIu-Se3Sa3O_TPyMbF-WX6nGzgi9MgNTX6inTyAempsrQDVPtug2y2Ox_9Hn5O_OG4Ya0AtDrH4_YIWt1xF1p9_6j3HVrHnX2gg9bA0s-WDpGqguLzQ4mco5P3lk7-AnNXXyM

   Zarka, Philippe; Lamy, Laurent; Rucker, Helmut O; Cecconi, Baptiste...

   Nature, Vol. 450, Issue 7167, pp. 265 - 267.

   The internal rotation rates of the giant planets can be estimated by cloud motions, but such an approach is not very precise because absolute wind speeds are not known a priori and depend on latitu... Read more

   The internal rotation rates of the giant planets can be estimated by cloud motions, but such an approach is not very precise because absolute wind speeds are not known a priori and depend on latitude: periodicities in the radio emissions, thought to be tied to the internal planetary magnetic field, are used instead. Saturn, despite an apparently axisymmetric magnetic field, emits kilometre-wavelength (radio) photons from auroral sources. This emission is modulated at a period initially identified as 10 h 39 min 24 ± 7 s, and this has been adopted as Saturn's rotation period. Subsequent observations, however, revealed that this period varies by ±6 min on a timescale of several months to years. Here we report that the kilometric radiation period varies systematically by ±1% with a characteristic timescale of 20-30 days. Here we show that these fluctuations are correlated with solar wind speed at Saturn, meaning that Saturn's radio clock is controlled, at least in part, by conditions external to the planet's magnetosphere. No correlation is found with the solar wind density, dynamic pressure or magnetic field; the solar wind speed therefore has a special function. We also show that the long-term fluctuations are simply an average of the short-term ones, and therefore the long-term variations are probably also driven by changes in the solar wind. Read less

   Journal Article  |  Full Text Online

2. When Is a Defibrillator Not a Defibrillator? When It’s Like a Clock Radio … . The Challenge of... 2007

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwpV1NT9wwEB1VIKFeSlsQbD8HiWvA6zjZrLQCoW0RqIAQlLPrJGPtFimLmnDoba_9CVw48sP2l3ScOIVWVAX1kBwi59Njz5v4zRuAdcM-USVhN0g41AkU93DgZLOCzFHeQ3axROr3nzlNUlh5zxJ-TcUyPOW4ZET2D150MN5QLt96nv1PzCHX_M7-p72jW7FdJX0dQo6W2eEvwNo_L_Y3v3Qv7pTe_-wuwpf2yWvaiSt2cJd_v1lrHtZCF62-42Pf8jk889gUdxpjegFPqHgJC4d-9X0JrnnmLnC_RIMfyLpcAbYhjtnxaFL9eWwbm8bVbHpV4sH4nLjFYLQ1ZOd5jicmH08Gm6Ot2fTHbHrD-w3e2GRx2BZ3wYnFs0b_t_qOpsjxuJGAxVNjiQ-NC2TwiieMdLGmBC3D2e7Hz8O9wNd3CDIViiqQXdvjAMVIyjNHcAyVoZwMiTzLhU1FSjGDpYwim0hKrXBadpmUSdwjBnkiC1cBbdKP0m5EIjG5sio2UZbmad_lFzMW7lMHZNut-qLR79Atse2rvvPJXT3Onhax5k_egV5rALpNUOUplUo_vkvd1aXUwlHjXASoOCpmRx8J1YHBrzM9hGmgieb-fsiN37fmpnmYu7UbU9DkstRxIvsOjHVgpbHC27fh-MgtH7_6v1u_hqf1b-uap_gG5qpvl_QW5pwhv_Pj6ye0Ris5

   Karsh, Ben-Tzion, PhD; Scanlon, Matthew, MD

   Annals Of Emergency Medicine, Vol. 50, Issue 4, pp. 433 - 435.

   Journal Article  |  Full Text Online

3. Clock synchronizing radio access networks to picosecond precision using optical clock... 2024

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwjV3NS8MwFA9uJz34OXA6JYddu7VJ2qYwBjIc4kFB5sFTSZPUDWEr-zjoH-Lf63tpK-tB8FIKrwklL8l7efm93yOkr8AmCskDT8JRxxOgYQ9pszyNkHcOJtZa0QzmlMnqLhfGWuvAZ3aAr-4u36z0DkNlsMJ5FMcxb5GW9KtkrXrbjeLAlSuAQzmWK2B-lYzHIzF8fJ48DUL0XpKG-XH1VJqbMK8sy_SEvNX_5AAlWMZgH1k_dGyGjsKiZm789_-fkuPK3aR35fw4Iwd2eU6O9kgIL8j3aD6egEn7GA3nY7r5XGrHl_sFQgqitTKLlRMpV1uRLkvg-IZuV7RYIN4djtSGFuuqWg9FKP07XRUuSo5d6N_eDdL0VhW2qIJWDWkxB5NKdQnv7JDX6f1s8uBV1Ro8DV7B1lOxEGFopeES3BipGTOgfm1yy3PNpG8Us1JlinNuGFOZDQx4MyY2KkqUsJJfEprLJMyC0PpSGZGLSIU6M1mC2cLg2Sa2S_q19tKiZONI3ZVcJFJUcloquUs6OPh7n5Tj3iW9WtVptVQ3KUuQMg9d0as_ml2TQwauTBl46ZH2dr2zN6SNM-HWzUF4zl6iHyvm3oc

   Clark, Kari A.; Zhou, Zichuan; Liu, Zhixin

   Journal Of Optical Communications And Networking, Vol. 16, Issue 1.

   Performing positioning of future mobile devices using trilateration through radio access networks would provide a robust alternative to currently used global navigation satellite systems. However, ... Read more

   Performing positioning of future mobile devices using trilateration through radio access networks would provide a robust alternative to currently used global navigation satellite systems. However, the positioning accuracy is strongly dependent on the time synchronization accuracy of the antennas used as location reference points. Consequently, achieving sub-30 cm positioning accuracies requires the synchronization of radio access network antennas to sub-nanosecond accuracy. Here we show a clock phase synchronization and optical clock signal distribution approach to clock synchronization in radio access networks that achieves 0.98-ps root-mean-square precision clock synchronization, in a real-time field-trial demonstration on 37.6-km dark fiber, with optical clock frequency synchronization and clock phase caching operating using 25.6-Gb/s commercial transceivers. We quantify the clock synchronization performance of our approach using standard metrics, including time deviation (TDEV) and mean time interval error (MTIE). Furthermore, we estimate the impact of varying the phase update rate used in clock phase caching on the clock synchronization performance of our approach. Through our two combined approaches, we explore a route towards achieving sub-nanosecond clock synchronization in radio access networks. Read less

   Journal Article  |  Full Text Online

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