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تحلیل مقایسه‌‌ای پراسنج یون‌سپهری VTEC و پراسنج هواشناختی بارش در اصفهان و شیراز | ||
| فیزیک زمین و فضا | ||
| مقاله 16، دوره 42، شماره 2، شهریور 1395، صفحه 439-448 اصل مقاله (1.09 M) | ||
| شناسه دیجیتال (DOI): 10.22059/jesphys.2016.55681 | ||
| نویسندگان | ||
| صدیقه امیدی1؛ محمدحسین معماریان* 2؛ سعید فرزانه3 | ||
| 1دانشجو/ دانشگاه یزد | ||
| 2عضو هیات علمی دانشکده فیزیک/ دانشگاه یزد | ||
| 3دانشجو/ دانشکده مهندسی نقشه برداری دانشگاه تهران | ||
| چکیده | ||
| مقاله حاضر در راستای کشف وجود یا عدم وجود رابطه تحولات پارامترهای یون‌سپهری با پدیده هواشناختی بارش، تغییرات بیشینه‌های روزانه محتوای کلی الکترونی قائم (VTEC) یون‌سپهری حاصل از پردازش داده‌های خام دو ایستگاه GPS را با تغییرات بارش ثبت شده در دو ایستگاه همدیدی واقع در محل ایستگاه‌های GPS، که در بازه زمانی مورد بررسی از نظر میزان بارش تفاوت قابل توجهی داشتند، مورد تحلیل و مقایسه قرار داده است. این تحلیل‌ها در شرایط آرام ژئومغناطیسی صورت گرفت و در نتیجه مشاهده شد که بین تغییرات بیشینه‌های VTEC یون‌سپهری و وقوع بارش، رابطه‌ای نظام‌مند وجود دارد، به‌گونه‌ای که پس از وقوع افت و خیزهایی با دامنه مخصوص در بیشینه VTEC، پیک‌های بارشی رخ داده‌اند. همچنین در ایستگاهی که تغییرات بیشینه‌های VTEC یون‌سپهری نسبتا ملایم بود، شرایط پایدار وردسپهری مشاهده شد، در حالی که در همان بازه زمانی در ایستگاهی که تغییرات بیشینه‌های مذکور نسبتا شدید بود، ناپایداری وردسپهری حاکم است. | ||
| کلیدواژه‌ها | ||
| GPS؛ VTEC؛ یون‌سپهر؛ وردسپهر؛ بارش | ||
| عنوان مقاله [English] | ||
| Comparative Analysis of Ionospheric VTEC Parameter and Meteorological Precipitation Parameter in Esfahan and Shiraz | ||
| نویسندگان [English] | ||
| sedighe omidi1؛ mohammad hossein memarian2؛ | ||
| چکیده [English] | ||
| Reduced rainfall in many parts of the world have prompted scientists to try to manipulate, in different ways, to the nature, causing precipitation from accumulated water in the atmosphere. Atmospheric ionization is a new method for producing precipitation and has attracted much attention. In this regard, in recent years, in some regions of the world, in different ways, the relation between meteorological phenomena, especially tropical cyclones, and ionosphere are studied. Because of importance of water and precipitation, in present paper in order to detect the presence or absence of correlation between ionosphere and the precipitation meteorological phenomena, used three kind of data consist of geomagnetic, ionospheric and meteorological data. The meteorological and geomagnetic data are measured data but the ionospheric data derived from raw GPS data. For analysis, In the first step, it analyzed the geomagnetic conditions by use of two geomagnetic indices consist of Kp and Dst for an especial period. In the second step, analyzed the data of ionospheric Vertical Total Electron Content (VTEC) and omitted geomagnetic disturbed days from same period. The daily maximums of VTEC, as the differentiating factor of various days, was selected. In the third step, it analyses and compares time series of maximums of ionospheric VTEC from processing of data from two GPS stations, in quiet geomagnetic conditions, with variations of precipitation recorded in two synoptic stations situated in same place of GPS stations, that have considerable difference in precipitation. These stations are Shiraz as the high rainfall station and Esfahan as the low rainfall station that considered in A 41-day period since 1 Jan to 10 February 2011. Also it is compared and analyzed the time series of variations of maximums of VTEC, to mean the difference of maximum of VTEC in any day than maximum of VTEC in days ago, with time series of precipitation in both stations. With these analysis it was observed that there is systematic relationship between variations of maximum of ionospheric VTEC and occurrence of precipitation. So that after occurrence intense fluctuations with special amplitude in maximum of VTEC, occur precipitation peaks. Therefore along with mild changes of maximums of ionospheric VTEC in a period, it observe tropospheric stable conditions and along with intense changes of maximums of ionospheric in the same period, it observed unstable tropospheric conditions and precipitation occurred. Also, the time series of maximums of VTEC in the same period obtained from running the global ionospheric model IRI2012 and compared with the time series of maximums of ionospheric VTEC from processing the raw data of GPS. it seems that the best kind of data for study the troposphere-ionosphere correlation, are ionospheric data from processing the raw data of GPS stations and the ionospheric data from running the ionospheric global models, due to the inability show details, are not suitable for this. It may be because of this, that maximums VTEC from processing raw data of GPS in this paper are point measurements and the maximums of VTEC from global ionospheric model IRI2012 has global scale and simulate large scale variations of ionospheric parameters. | ||
| کلیدواژه‌ها [English] | ||
| VTEC, GPS, Ionosphere, Troposphere, Precipitation | ||
| مراجع | ||
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Choi, B. K., Lee, S. J. and Park, J. U., 2011, Monitoring the ionospheric total electron content variations over the Korean Peninsula using a GPS network during geomagnetic storms, Earth Planets Space, 63, 469-476.
Ciraolo, L., Azplicueta, F., Brunini, C., Meza, A. and Radicella, S. M., 2006, Calibration errors on experimental slant total electron content (TEC) determined with GPS, Geodesy, J., 81, 111-120.
Hargreaves, J. K., 1992, The solar-terrestrial evironment, Cambridge University Press, UK-Cambridge.
Hofmann-Wellenhof, B., Lichtenegger, B. and Wasle, E., 2008, GNSS - global navigation satellite systems GPS, GLONASS, Galileo, and more. Springer-Verlag Wien.
Mayaud, P. N., 1980, Derivation, meaning and use of geomagnetic indices, Washington, DC, American Geophysical Union.
McPherron, R. L., 1995, Standard indices of geomagnetic activity, introduction to space physics, Cambridge University Press, UK - Cambridge.
Rycroft, M. J., Nicoll, K. A., Aplin, K. L. and Harrison, R. G., 2012, Recent advances in global electric circuit coupling between the space environment and the troposphere, Journal of Atmospheric and Solar-Terrestrial Physics, 90-91, 198-211.
Nicoll, K. A. and Harrison, R. G., 2009a, Vertical current flow through extensive layer clouds, Journal of Atmospheric and Solar-Terrestrial Physics, 71, 2040-2046.
Perrone, L. and Franceschi, G. D., 1998, Solar, ionospheric and geomagnetic indices, Annali di geofisica, 41, 5-6.
Polyakova, A. S. and Perevalova, N. P., 2013, Comparative analysis of TEC disturbances over tropical cyclone zones in the North–West Pacific Ocean, Advances in Space Research, 52, 1416-1426.
Rozhnoi1, A., Solovieva1, M., Levin, B., Hayakawa, M. and Fedun, V., 2014, Meteorological effects in the lower ionosphere as based on VLF/LF signal observations, Natural Hazards and Earth System Sciences. J., 2, 2789-2812.
Rycroft, M. J. and Israelsson, S., Price, C., 2000, The global atmospheric electric circuit, Journal of Atmospheric and Solar-Terrestrial Physics, 62, 1563-1576.
Schaer, S., 1999, Mapping and predicting the Earth’s ionosphere using the global positioning system, Ph.D. Thesis, Astronomical Institute, University of Berne, Switzerland.
Seeber, G., 2003, Satellite geodesy: foundations, methods and application, Walter de Gruyter, Berlin and New York, 589.
Singh, A. K., Siingh, D., Singh, R. P. and Mishra Sandhya., 2011, Electro dynamical coupling of Earth’s atmosphere and ionosphere: an overview, International Journal of Geophysics, 2011, http://dx.doi.org/10.1155/2011/971302.
Sorokin, V. M., Yaschenko, A. K., Chmyrev, V. M. and Hayakawa, M., 2006, DC electric field formation in the mid-latitude ionosphere over typhoon and earthquake regions, Phys. Chem. Earth, 31, 454-461.
Tinsley, B. A., 2000, Influence of the solar wind on the global electric circuit, and inferred effects on cloud microphysics, temperature, and dynamics of the troposphere, Space Science Reviews, 94, 231-258. Tinsley, B. A., Rohrbaugh, R. P. and Hei, M., 2001, Electroscavenging in clouds with broad droplet size distributions and weak electrification, Atmosph. Res., 59-60, 115-135.
Vanina-Dart, L. B., Romanov, A. A. and Sharkov, E. A., 2011, Influence of a tropical cyclone on the upper ionosphere according to tomography sounding data over Sakhalin Island in November 2007, Geomagnet. Aeronom, 51, 774-782.
Wormell, T. W., 1930, Vertical electric currents below thunderstorms and showers, Proceedings of the Royal Society, A 127, 567-590
Zhou, L. and Tinsley, B. A., 2007, Production of space charge at the boundaryes of layer clouds, Journal of Geohpysical Research, 112, D11203, http://dx.doi.org/10.1029/2006JD007998. | ||
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