Radio Science

  1. Research Articles

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    2. Research Articles
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      Ray tracing technique for global 3-D modeling of ionospheric electron density using GNSS measurements (pages 539–553)

      Mohamad Mahdi Alizadeh, Harald Schuh and Michael Schmidt

      Version of Record online: 28 JUN 2015 | DOI: 10.1002/2014RS005466

      Key Points

      • Ionosphere modeling, Global Navigation Satellite Systems, ray tracing technique, and Formosat-3/Cosmic
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      Switched-beam array of dielectric rod antenna with RF-MEMS switch for millimeter-wave applications (pages 177–190)

      M. W. Rousstia, A. C. F. Reniers and M. H. A. J. Herben

      Version of Record online: 12 MAR 2015 | DOI: 10.1002/2014RS005471

      Key Points

      • The coupling between the array element is sufficiently low
      • Uniform antenna performance is observed for every scan angle
      • High-gain and low sidelobe level antenna is realized
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      Time and frequency transfer system using GNSS receiver (pages 1171–1182)

      Jia-Lun Wang, Shi-Yu Huang and Chia-Shu Liao

      Version of Record online: 5 DEC 2014 | DOI: 10.1002/2014RS005460

      Key Points

      • The GPS time link accuracy can achieve within 2 ns in long-baseline link 10,000 km
      • The system has less than 25 ns and 1.1 × 10–13 uncertainty for time and frequency
      • Proposed system provides unbroken time and frequency link tracing back to SI
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      TaiWan Ionospheric Model (TWIM) prediction based on time series autoregressive analysis (pages 977–986)

      L. C. Tsai, Ernest P. Macalalad and C. H. Liu

      Version of Record online: 23 OCT 2014 | DOI: 10.1002/2014RS005448

      Key Points

      • A time series autoregressive model was developed to forecast the ionosphere
      • The 3-D and global TaiWan Ionospheric Model (TWIM) was improved to be real time
      • The TWIM exhibits vertical Chapman layers and horizontal spherical harmonics
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      A focusing reflectarray and its application in microwave virus sanitizer (pages 890–898)

      Wan-Ting Hung, Jen-Jung Tung and Shih-Yuan Chen

      Version of Record online: 9 OCT 2014 | DOI: 10.1002/2014RS005481

      Key Points

      • A focusing reflectarray is proposed for use in microwave virus sanitizer
      • Design details of the proposed focusing reflectarray are discussed
      • An 8 GHz prototype design is fabricated, and its feasibility is also verified
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      Spatial distribution and temporal variations of occurrence frequency of lightning whistlers observed by VLF/WBA onboard Akebono (pages 753–764)

      Yuta Oike, Yoshiya Kasahara and Yoshitaka Goto

      Version of Record online: 15 SEP 2014 | DOI: 10.1002/2014RS005523

      Key Points

      • Lightning whistlers in the plasmasphere were statistically analyzed
      • Lightning whistlers were mainly observed in the L shell region below 2
      • Occurrence of the whistlers has clear diurnal and seasonal dependence
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      Greenland telescope project: Direct confirmation of black hole with sub-millimeter VLBI (pages 564–571)

      M. Inoue, J. C. Algaba-Marcos, K. Asada, R. Blundell, W. Brisken, R. Burgos, C.-C. Chang, M.-T. Chen, S. S. Doeleman, V. Fish, P. Grimes, J. Han, H. Hirashita, P. T. P. Ho, S.-N. Hsieh, T. Huang, H. Jiang, E. Keto, P. M. Koch, D. Y. Kubo, C.-Y. Kuo, B. Liu, P. Martin-Cocher, S. Matsushita, Z. Meyer-Zhao, M. Nakamura, P. Napier, H. Nishioka, G. Nystrom, S. Paine, N. Patel, N. Pradel, H.-Y. Pu, P. A. Raffin, H.-Y. Shen, W. Snow, R. Srinivasan and T.-S. Wei

      Version of Record online: 30 JUL 2014 | DOI: 10.1002/2014RS005450

      Key Points

      • A submm telescope is coordinated to establish it at the Summit of Greenland
      • Black Hole shadow imaging is the primary target for the submm VLBI
      • The Summit shows low opacity at 225 GHz and is expected excellent up to THz regime