https://ir.lib.ncu.edu.tw/handle/987654321/87329 太空科學是自然科學，也是應用科學，興趣與出路是可以共存的。我們希望為國內愛好太空科學的學子，提供一個高 CP 學習環境與機會。 Search the Channel s https://ir.lib.ncu.edu.tw/simple-search https://ir.lib.ncu.edu.tw/handle/987654321/102368 title: Worst-Case GPS Scintillations on the Ground Estimated from Radio Occultation Observations of FORMOSAT-3/COSMIC During 2007–2014 abstract: 摘要： The FORMOSAT-3/COSMIC (F3/C) satellite probes the S4 scintillation index profile of GPS signals by using the radio occultation (RO) technique. In this study, for practical use on the Earth’s surface, a method is developed to convert and integrate the probed RO S4 index, so obtaining the scintillation on the ground. To estimate the worst case, the maximum value on each profile probed by F3/C, which is termed S4max, is isolated. The isolated data are further used to construct the global three-dimensional distributions of S4max for various local times, seasons, solar activities, and locations. The converted S4max for the first time estimates the global distribution of ionospheric scintillations in the GPS L1 band C/A code signal on the ground. The results show that the worst-case scintillations appear within the low-latitude region of ±30°N, peaking around ±20°N magnetic latitude; they begin at 1900 MLT, reach their maximum at 2100 MLT, and vanish by about 0200–0300 MLT. The most pronounced low-latitude scintillation occurs over the South American and African sectors. 其他題名： Surv Geophys 出版者： Dordrecht: Springer Netherlands 出版日期： 2016-07 出處： Surveys in geophysics, 2016-07, Vol.37 (4), p.791-809 資源來源： SpringerLink Journals 版權： Springer Science+Business Media Dordrecht 2015 版權： Springer Science+Business Media Dordrecht 2016 識別號： ISSN: 0169-3298 識別號： EISSN: 1573-0956 識別號： DOI: 10.1007/s10712-015-9355-x <br> https://ir.lib.ncu.edu.tw/handle/987654321/102367 title: Wavenumber broadening of the quasi 2 day planetary wave in the ionosphere abstract: 摘要： Using the Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model, we investigate the observed zonal wavenumber broadening phenomena in the ionospheric quasi 2 day oscillation (QTDO) that is associated with westward zonal wavenumber 3 (W3) quasi 2 day wave (QTDW) perturbations in the mesosphere and lower thermosphere (MLT). We aim to explain why the observed longitudinal structures of the QTDOs in the ionosphere are different from those of the QTDWs in the MLT. We find that large QTDOs in the ionosphere with zonal wavenumbers other than W3 occur in the model run with the true magnetic field, but not in the model run with an aligned dipole field. These numerical experiments suggest that the occurrence of the additional zonal wavenumbers in ionospheric QTDOs is related to the longitudinal variations of the Earth's magnetic field configuration, strength, and dip angle, which have distinct stationary zonal wavenumbers. We also find that when the specified W3 QTDW winds drive ionospheric plasma motion in the magnetic field, the resultant QTDOs in ionospheric parameters, such as the dynamo electric field, ion vertical drifts, plasma densities, and total electron content, have more complicated longitudinal variations than simply W3, corresponding to a zonal wavenumber broadening effect. Additionally, we find that the wavenumber broadening effect in the ionosphere can be fed back onto the neutrals through ion drag, to produce small QTDW winds with new wavenumbers in the thermosphere. 其他題名： J. Geophys. Res. Space Physics 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2013-06 出處： Journal of Geophysical Research: Space Physics, 2013-06, Vol.118 (6), p.3515-3526 資源來源： Wiley Online Library 版權： 2013. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-9380 識別號： ISSN: 2169-9402 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/jgra.50307 <br> https://ir.lib.ncu.edu.tw/handle/987654321/102366 title: Validation of FORMOSAT-3/COSMIC level 2 &quot;atmPrf&quot; global temperature data in the stratosphere abstract: 摘要： GPS radio occultations by Formosa Satellite mission-3/Constellation Observing System for Meteorology, Ionosphere, and Climate (FORMOSAT-3/COSMIC) provide bending angle profiles, which are further processed to give profiles of temperature and water vapour in the lower atmosphere and electron density in the upper atmosphere. The level 2 &quot;atmPrf&quot; (atmospheric profile) product of version 2010.2640 gives temperature from surface to 0.2 hPa (~ 60 km). This is a dry temperature data product that does not include relative humidity in the inversion process and hence is reliable at altitudes < 100 hPa and erroneous at lower altitudes. In the current study we compare the COSMIC &quot;atmPrf&quot; data from December 2010 to November 2011 with other satellite (SABER/TIMED and MLS/Aura) temperatures from 50 to 0.2 hPa, COSMIC &quot;wetPrf&quot; data and reanalysis (NCEP, ERA-Interim and UKMO) outputs at 100, 10, 1 and 0.5 hPa pressure levels. The satellite comparisons show that below 1 hPa the observed median differences are most likely produced due to the biases in the retrievals of SABER and MLS. &quot;atmPrf&quot; and &quot;wetPrf&quot; temperatures compare extremely well in the common altitudes with differences being absolute zero between 200 and 10 hPa. When compared to reanalysis outputs, COSMIC seasonal means match NCEP and ECMWF seasonal mean temperatures very well, especially at 100 and 10 hPa. We conclude from this study that with the COSMIC dry temperature retrievals obtained from radio occultations of GPS, there is a 20 km extension of reliable data in the middle atmosphere. &quot;atmPrf&quot; data are of good quality and provide reliable and unprecedentedly large number of profiles at greater temporal and spatial resolutions for further studies and investigations of the middle atmosphere up to 1 hPa, i.e., approximately up to the stratopause at around 50 km. 出版者： Katlenburg-Lindau: Copernicus Publications 出版日期： 2014-03-12 出處： Atmospheric Measurement Techniques, 2014-03, Vol.7 (3), p.731-742 資源來源： Publicly Available Content Database 版權： COPYRIGHT 2014 Copernicus GmbH 版權： Copyright Copernicus GmbH 2014 識別號： ISSN: 1867-8548 識別號： ISSN: 1867-1381 識別號： EISSN: 1867-8548 識別號： DOI: 10.5194/amt-7-731-2014 <br> https://ir.lib.ncu.edu.tw/handle/987654321/102364 title: Two-dimensional electrostatic solitary structures in electron-positron plasmas abstract: 摘要： Due to the inertia symmetry the issue of whether electrostatic solitons may possibly form in pair plasmas has been addressed in a number of papers. Recently we have shown that pair solitons with interlacing electron and positron holes in electron-positron plasmas may form by means of streaming instability based on one-dimensional particle-in-cell simulations Jao and Hau (2012 Phys. Rev. E 86 056401). In this paper we present the first simulation results of two-dimensional electrostatic solitons in pair plasmas imbedded in a stationary background magnetic field. It is shown that the features of electrostatic solitary structures may depend on the ratio of to where and denote the electron cyclotron and plasma frequency, respectively. In particular, for weakly magnetized or unmagnetized plasmas with both parallel and transverse electric field with the same order of magnitude may first develop and be dissipated in the nonlinear stage such that electrostatic solitons are unable to form by the streaming instability, while for pair solitons resembling those occurring in one-dimensional simulations may possibly form. Comparisons between linear fluid theory and particle-in-cell simulations are made. 其他題名： NJP 其他題名： New J. Phys 出版者： Bristol: IOP Publishing 出版日期： 2015-05-27 出處： New journal of physics, 2015-05, Vol.17 (5), p.53047 資源來源： Institute of Physics Open Access Journal Titles 版權： 2015 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft 版權： 2015. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1367-2630 識別號： EISSN: 1367-2630 識別號： DOI: 10.1088/1367-2630/17/5/053047 識別號： CODEN: NJOPFM <br>