<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 20:10:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="18.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="2 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.04.03 (093) 20:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202609304032010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="12.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.586" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.676" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="110.000" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="20.000" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="435.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.051" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="387.588" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="293.589" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.709" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="132.717" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="56.557" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="70.648" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="139.690" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.850" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="187">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9 3.95 4.0 4.05 4.1 4.15 4.2 4.25 4.3 4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 255.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 265.000 265.000 270.000 270.000 270.000 270.000 270.000 270.000 271.667 273.333 275.000 280.000 285.000 282.500 280.000 280.000 285.000 287.500 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 296.364 297.727 299.091 300.455 301.818 303.182 304.545 305.909 307.273 308.636 310.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 316.471 317.941 319.412 320.882 322.353 323.824 325.294 326.765 328.235 329.706 331.176 332.647 334.118 335.588 337.059 338.529 340.000 340.000 340.000 340.000 345.000 346.250 347.500 348.750 350.000 350.000 350.000 350.000 352.500 355.000 355.000 360.000 360.000 360.000 360.000 360.000 362.500 365.000 365.000 367.500 370.000 370.000 370.000 372.500 375.000 375.000 375.000 377.500 380.000 380.000 380.000 380.000 382.500 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 390.000 390.000 390.000 390.000 391.667 393.333 395.000 396.667 398.333 400.000 401.667 403.333 405.000 406.667 408.333 410.000 411.667 413.333 415.000 416.667 418.333 420.000 421.667 423.333 425.000 426.667 428.333 430.000 431.667 433.333 435.000 435.000 440.000 440.000 440.000 445.000 435.000 445.000 450.000 450.000 455.000 460.000 460.000 465.000 470.000 475.000 477.500 480.000 480.000 485.000 490.000 492.500 496.813 501.573 506.856 512.751 519.372 526.861 535.401 545.231 556.666 570.134 586.231 605.810 630.136 661.175
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 60 57 60 60 63 63 63 63 63 66 0 66 66 63 66 66 63 60 57 51 0 0 66 69 0 0 66 63 66 0 0 63 0 0 66 63 66 66 63 0 45 0 0 0 0 0 0 0 0 66 57 63 66 69 69 69 66 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 66 69 72 72 66 0 0 0 63 69 72 75 0 69 72 60 0 66 72 72 0 66 72 0 63 69 72 0 60 69 72 0 60 66 69 72 0 63 66 72 72 63 0 66 69 72 72 72 72 57 0 0 0 69 69 0 69 69 0 66 66 69 69 63 0 69 57 0 66 0 57 63 48 54 57 48 57 60 48 54 57 54 42 57 57 54 57 51 57 54 48 42 0 48 54 0 54 0 51 0 54 54 0 54 0 57 48 51 51 48 45 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.746 90.0 95.0 100.0 105.0 110.0 115.0 117.928 120.0 125.0 125.855 130.0 133.783 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 387.588 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.222 1.375 1.776 1.985 2.051 2.0 1.92 1.92 1.92 1.92 1.988 2.051 2.079 2.193 2.309 2.428 2.549 2.675 2.805 2.94 3.081 3.228 3.381 3.542 3.711 3.888 4.073 4.267 4.471 4.684 4.906 5.138 5.379 5.629 5.887 6.153 6.425 6.704 6.989 7.277 7.569 7.862 8.157 8.451 8.745 9.035 9.322 9.605 9.881 10.149 10.409 10.658 10.896 11.12 11.329 11.52 11.693 11.846 11.976 12.082 12.163 12.218 12.246 12.25 12.249 12.237 12.214 12.181 12.138 12.085 12.023 11.952 11.874 11.788 11.696 11.596 11.491 11.381 11.265 11.145 11.021 10.893 10.762 10.627 10.49 10.351 10.21 10.067 9.922 9.776 9.63 9.482 9.335 9.187 9.039 8.891 8.743 8.596 8.45 8.304 8.159 8.015 7.872 7.73 7.589 7.45 7.313 7.176 7.042 6.908 6.777 6.647 6.519 6.392 6.268 6.145 6.024 5.905 5.787 5.672 5.558 5.446 5.336 5.228 5.121 5.017 4.914 4.813 4.714 4.617 4.521 4.427 4.335 4.245 4.156 4.069 3.984 3.9 3.818 3.737 3.658 3.581 3.505 3.431 3.358 3.286 3.216 3.148 3.081 3.015 2.95 2.887 2.825 2.765 2.705 2.647 2.59 2.535 2.48 2.426 2.374 2.323 2.273 2.224 2.176 2.129 2.083 2.037 1.993 1.95 1.908 1.866 1.826 1.786 1.748 1.71 1.673 1.636 1.601 1.566 1.532 1.498 1.466 1.434 1.403 1.372 1.342

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.051" PeakHeight="110.0" Num="3" Error="0.0">
-29.145 11.22 -2.329
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.051" EndFrequency="12.25" PeakHeight="387.588" Num="5" zHalfNm="293.589" Error="3.535">
-227.738 -26.276 0.02 -0.912 1.101
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="23.783" Depth="0.131"/>
<TopsideChapman PeakHeight="387.588" PeakDensity="1861817.6" PeakScaleHeight="70.648" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
