Low latitude ionospheric effects near longitude 120°E during the great geomagnetic storm of july 2000

Liu, Libo; Wan, Weixing; Ning, Baiqi; Yuan, Hong; Liu, J. Y.

doi:10.1007/bf02889696

Cited by 18 publications

(10 citation statements)

References 11 publications

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“…In this movement, the low latitude ionization may remain unchanged or even increase due to the supply from higher altitudes where the downward E×B drift squeezes the plasma in magnetic flux tubes down to lower altitudes. Liu et al (2002) used the Fejer and Scherliess (1997) empirical model of the equatorial zonal electric field driven by the AE index to calculate the vertical drift during the poststorm increase. The model did not predict any E×B drift on 17 and 18 July 2000.…”

Section: -18 July 2000mentioning

confidence: 99%

“…The ion drift data from ROCSAT used in their analysis indicated a slight upward drift, but this was not enough strong to be able explain the observed enhancement. Liu et al (2002Liu et al ( , 2004 reported a marked increase of foF2 in low latitude stations 2 days following the onset of the storm. This increase following the geomagnetic storm of 14-17 July 2000, which they discussed in their 2002 publication, was observed at the low latitude ionosonde stations of Chungli (13.8 • N magnetic latitude) and Wuhan (19.3 • N magnetic latitude), but not at Kokubunji (25.7 • N magnetic latitude).…”

Section: Introductionmentioning

confidence: 99%

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GPS observations of post-storm TEC enhancements at low latitudes

et al. 2006

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In a previous work (J. Geophys. Res., 110(A01308), [1][2][3][4][5][6][7][8][9][10][11] 2005), the authors developed an original approach to the processing of total electron content (TEC) data obtained by GPS signals from the Japan receiver network. This approach includes removing the diurnal and seasonal variation carried by 27-day medians and the solar rotation periodicity. The relative deviations of TEC from the median-from all measured locations at a given hour-were then approximated by a regression line along the main prolongation of the Japan islands, between latitudes 24• and 45• N. The two variables of the regression line, the average value at the center and the slope were obtained as a time series, and their behavior during geomagnetic storms in the period 2000-2002 were analyzed. One interesting result was the observed enhancement of TEC at the end of the recovery phase of the storms. The slope variations clearly showed that this enhancement started from the south and was interpreted as a poleward expansion of equatorial crest. In the present paper we further analyze this post-storm phenomenon, adding foF2 data from Japanese Kokubunji and Okinawa ionosondes. We also show the latitude extension of the poleward expansion by using lat/UT contour plots. The results confirm that most of the post-storm TEC enhancements are part of the equatorial crest region which extends poleward during nighttime. In some cases, the enhanced TEC structures develop by separating from the crest region. Daytime TEC enhancements were also observed. Their structures are not confined to the equatorial crests region, but occupy the whole latitude range considered in this study. TEC post-storm enhancements were generally found to be in agreement with foF2 variations.

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Section: -18 July 2000mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

GPS observations of post-storm TEC enhancements at low latitudes

et al. 2006

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“…Numerous studies have investigated storm time ionospheric responses theoretically and observationally (e.g. Lee et al, 2004;Liu et al, 2002Liu et al, , 2004Kutiev et al, 2005;Zhao et al, 2005Zhao et al, , 2007Maruyama and Nakamura, 2007;Astafyeva, 2009a, b).…”

Section: Introductionmentioning

confidence: 99%

Time delay and duration of ionospheric total electron content responses to geomagnetic disturbances

2010

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Abstract. Although positive and negative signatures of ionospheric storms have been reported many times, global characteristics such as the time of occurrence, time delay and duration as well as their relations to the intensity of the ionospheric storms have not received enough attention. The 10 years of global ionosphere maps (GIMs) of total electron content (TEC) retrieved at Jet Propulsion Laboratory (JPL) were used to conduct a statistical study of the time delay of the ionospheric responses to geomagnetic disturbances. Our results show that the time delays between geomagnetic disturbances and TEC responses depend on season, magnetic local time and magnetic latitude. In the summer hemisphere at mid-and high latitudes, the negative storm effects can propagate to the low latitudes at post-midnight to the morning sector with a time delay of 4-7 h. As the earth rotates to the sunlight, negative phase retreats to higher latitudes and starts to extend to the lower latitude toward midnight sector. In the winter hemisphere during the daytime and after sunset at mid-and low latitudes, the negative phase appearance time is delayed from 1-10 h depending on the local time, latitude and storm intensity compared to the same area in the summer hemisphere. The quick response of positive phase can be observed at the auroral area in the night-side of the winter hemisphere. At the low latitudes during the dawn-noon sector, the ionospheric negative phase responses quickly with time delays of 5-7 h in both equinoctial and solsticial months.Our results also manifest that there is a positive correlation between the intensity of geomagnetic disturbances and the time duration of both the positive phase and negative phase. The durations of both negative phase and positive phase have clear latitudinal, seasonal and magnetic local time (MLT) dependence. In the winter hemisphere, long durations for the positive phase are 8-11 h and 12-14 h during the daytime at middle and high latitudes for 20≤Ap<40 and Ap≥40.

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“…Numerous studies have investigated storm time ionospheric responses theoretically and observationally (e.g. Lee et al 2004;Liu et al 2002Liu et al , 2004Kutiev et al 2005;Zhao et al 2005Zhao et al , 2007Maruyama and Nakamura 2007;Astafyeva 2009aAstafyeva , 2009b.…”

Section: ; Ramamentioning

confidence: 98%

Storm time response of GPS-derived total electron content (TEC) during low solar active period at Indian low latitude station Varanasi

Kumar

Singh

2010

Astrophys Space Sci

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The present paper analyzes the dual frequency signals from GPS satellites recorded at Varanasi (Geographic latitude 25°, 16 N, longitude 82°, 59 E) near the equatorial ionization anomaly (EIA) crest in India, to study the effect of geomagnetic storm on the variation of TEC, during the low solar active period of May 2007 to April 2008. Three most intense-but still moderate class-storms having a rapid decrease of Dst-index observed during the GPS recorded data have been analyzed, which occurred on

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Low latitude ionospheric effects near longitude 120°E during the great geomagnetic storm of july 2000

Cited by 18 publications

References 11 publications

GPS observations of post-storm TEC enhancements at low latitudes

GPS observations of post-storm TEC enhancements at low latitudes

Time delay and duration of ionospheric total electron content responses to geomagnetic disturbances

Storm time response of GPS-derived total electron content (TEC) during low solar active period at Indian low latitude station Varanasi

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