Article Figures & Data
Figures
- FIGURE 1
GNSS reference stations and networks used in Phase I ionospheric study (Yoon et al., 2017)
- FIGURE 2
Station-pair method for estimating anomalous ionospheric gradients (left) and time-step method for estimating nominal ionospheric gradients and validating anomalous ionospheric gradients (right)
- FIGURE 3
Differential vertical ionospheric delay results on the highest daytime SOR day (March 7, 2012)
- FIGURE 4
Complementary CDF of normalized vertical ionospheric gradients on the highest daytime SOR day (March 7, 2012)
- FIGURE 5
σvig overbound results from the time-step method and Brazilian GNSS network data on the highest daytime SOR day (March 7, 2012)
- FIGURE 6
Summary of σvig overbound results for each Data ID in Datasets 1 and 2
- FIGURE 7
Slant ionospheric delay (top) and vertical ionospheric gradient (bottom) estimates for four satellite-station pairs on October 1, 2012. There were large gradients exceeding 100 mm/km after 6 a.m. local time
- FIGURE 8
Differential vertical ionospheric delay vs. IPP separation distance on October 25, 2011
- FIGURE 9
Slant ionospheric delay (top) and vertical ionospheric gradient (bottom) estimates for several satellites at station POAL on October 25, 2011
- FIGURE 10
σvig overbound vs. local time for nine days of combined data
- FIGURE 11
Zoomed-in view of σvig overbound vs. local time for nine days of combined data
- FIGURE 12
Illustration of “geometric similarity” method
- FIGURE 13
Temporal delay difference estimation procedure
- FIGURE 14
Locations of the GEONET reference receivers in September 2010
- FIGURE 15
Temporal delay difference ((a), on left) and temporal gradient ((b), on right) vs. IPP separation distance
Tables
ID Date Phase I Category Daytime SOR (Rank) (%) σvig overbound 1 March 7, 2012 Selected by Dst 2.1141 (1st) 10 mm/km 2 January 25, 2012 Selected by Dst 2.1048 (2nd) 9 mm/km 3 March 9, 2012 Selected by Dst 0.7714 (3rd) 9 mm/km 4 October 25, 2011 Selected by Dst 0.6875 (4th) 10 mm/km 5 October 8, 2012 Selected by Dst 0.5837 (5th) 8 mm/km ID Date Phase I Category Nighttime SOR (Rank) (%) σvig overbound 6 October 1, 2012 Selected by Dst 18.3265 (1st) N/A (Anomalous day) 7 March 3, 2014 Scintillating day 17.4038 (2nd) 12 mm/km 8 (= 4) October 25, 2011 Selected by Dst 14.9240 (3rd) 10 mm/km 9 March 4, 2014 Scintillating day 14.8806 (4th) 12 mm/km 10 February 25, 2014 Scintillating day 14.4754 (5th) 13 mm/km 11 February 26, 2014 Scintillating day 13.3409 (6th) 11 mm/km - TABLE 3
Sunrise and sunset times (in standard time) and length of day at Rio de Janeiro of each month for the same day of the month during 2018
Date (day month year) Sunrise time (standard time) (hour:minute) Sunset time (standard time) (hour:minute) Length of Day (hour:minute:second) 21 January 2018 05:24 18:43 13:18:14 21 February 2018 05:44 18:27 12:43:06 21 March 2018 05:56 18:02 12:05:48 21 April 2018 06:08 17:34 11:26:01 21 May 2018 06:21 17:17 10:55:48 21 June 2018 06:32 17:16 10:43:21 21 July 2018 06:31 17:26 10:55:13 21 August 2018 06:13 17:38 11:25:56 21 September 2018 05:43 17:48 12:05:05 21 October 2018 05:15 17:59 12:44:26 21 November 2018 04:59 18:18 13:18:52 21 December 2018 05:04 18:37 13:33:01
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