The occurrence of polar cap patches in TEC fluctuations detected using GPS measurements in southern hemisphere

被引：42
作者：
Institute of Geodesy, University of Warmia and Mazury in Olsztyn, Oczapowski St.1, 10-957 Olsztyn, Poland [1 ]
不详 [2 ]
机构：
[1] Institute of Geodesy, University of Warmia and Mazury in Olsztyn, 10-957 Olsztyn
[2] WD IZMIRAN, 236017 Kaliningrad
来源：
Adv. Space Res. | 2006年 / 11卷 / 2601-2609期
关键词：
GPS; Modeling of ionosphere; Polar cap patches; TEC fluctuations;
D O I：
10.1016/j.asr.2005.12.006
中图分类号：
学科分类号：
摘要：
GPS technique is widely used to study the global structure and dynamics of the ionosphere. This paper presents data on the occurrence of large-scale ionospheric irregularities observed at Antarctic stations McMurdo-MCM4 (-78N, 167E, Φ = 80°), Casey-CAS1 (-66N, 110E, Φ = 80°), Mawson-MAW1 (-68N, 63E, Φ = 71°), and Davis-DAV1 (-69N, 78E, Φ = 75°) in 2001. The irregularities caused strong Total Electron Content fluctuations. The intensity of TEC fluctuations was estimated with the ROT parameter and rate of TEC index (ROTI) expressed in TECU/min. Storm-time development of TEC fluctuations are presented for two geomagnetic active periods: June and September 2001. Data on temporal variations in TEC along individual satellites passes were also analyzed. Polar patches were associated with deep TEC fluctuations as the TEC enhancements were 2-10 times larger than the background, whereas the TEC increased by 10-50 TECU in about 5-10 min. The duration of such structures is 10-20 min. At 4-5 h interval, 3-5 strong and some weak patches were detected. The activity of patches depends to a low degree only on the magnetic activity index Kp. The intensity of TEC fluctuations increases during substorm activity. Diurnal, seasonal dependence, and longitudinal features of the occurrence of polar patches are also presented in the report. © 2005 COSPAR.
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页码：2601 / 2609
页数：8
相关论文
共 25 条
  • [1] Aarons J., GPS system phase fluctuations at auroral latitudes, J. Geophys. Res., 102, A8, pp. 17219-17231, (1997)
  • [2] Aarons J., Lin B., Mendillo M., Liou K., Codrescu M., GPS phase fluctuations and ultraviolet images from the Polar satellite, J. Geophys. Res., 105, A3, pp. 5201-5213, (2000)
  • [3] Basu S., Groves K.M., Quinn J.M., Doherty P., A comparison of TEC fluctuations and scintillations at Ascension Island, J. Atmos. Sol-Terr. Phys., 61, pp. 1219-1226, (1999)
  • [4] Buchau J., Reinisch B.W., Weber E.J., Moore J.G., Structure and dynamics of the winter polar cap F-region, Radio Sci., 18, 6, pp. 995-1010, (1983)
  • [5] Buchau J., Weber E.J., Anderson D.N., Carlson H.C., Moore J.G., Reinisch B.W., Livingston R.C., Ionospheric structures in the polar cap: Their origin and relation to 250-MHz scintillation, Radio Sci., 20, 3, pp. 325-338, (1985)
  • [6] Buchau J., Reinisch B.W., Electron density structures in the polar F-region, Adv. Space Res., 11, 10, pp. 29-37, (1991)
  • [7] Coley W.R., Heelis R.A., Adaptive identification and characterization of polar ionization patches, J. Geophys. Res., 100, pp. 23819-23827, (1995)
  • [8] Coley W.R., Heelis R.A., Structures and occurrence of polar ionization patches, J. Geophys. Res., 103, A2, pp. 2201-2208, (1998)
  • [9] Coley W.R., Heelis R.A., Seasonal and universal time distribution of patches in the northern and southern polar caps, J. Geophys. Res., 103, A12, pp. 29229-29237, (1998)
  • [10] Crowley G., Ridley A.J., Deist D., Wing S., Knipp D.J., Emery B.A., Foster J., Heelis R., Hairston M., Reinisch B.W., Transformation of high-latitude ionospheric F region patches into blobs during the March 21, 1990, storm, J. Geophys. Res., 105, A3, pp. 5215-5230, (2000)
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