<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 13:10:00.000"
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="1 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Multiple candidates for F2x cusp, 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" >
2026.03.31 (090) 13:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202609003311310009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="10.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.577" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.417" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.700" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.760" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="215.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="215.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="99.891" Name="h`E" 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="8.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="395.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.266" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.303" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="362.294" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="239.848" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.349" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="165.503" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="49.611" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="89.305" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="184.880" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.700" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="116">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
215.000 215.000 217.500 220.000 220.000 225.000 230.000 235.000 240.000 245.000 248.125 251.250 254.375 257.500 260.625 263.750 266.875 270.000 275.000 275.000 275.000 280.000 283.750 287.500 291.250 295.000 300.000 300.000 305.000 310.000 315.000 315.000 320.000 323.333 326.667 330.000 330.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 350.000 355.000 355.000 355.000 355.000 355.000 355.000 357.500 360.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 405.000 405.000 410.000 415.000 420.000 425.000 430.000 435.000 440.000 445.000 450.000 455.000 460.000 465.000 470.000 475.000 480.000 485.000 490.000 495.000 500.000 510.000 515.000 520.000 530.000 538.123 546.993 556.716 567.423 579.270 592.450 607.201 623.822 642.693 664.303
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 54 0 54 54 0 48 0 0 51 0 0 0 0 0 54 0 57 54 57 51 51 0 0 0 54 54 51 51 0 51 54 54 0 0 57 57 60 60 57 57 57 60 63 60 60 63 63 63 63 60 57 57 63 0 54 54 60 63 66 48 57 60 63 66 66 63 69 66 63 66 63 69 63 66 63 66 63 60 63 63 63 60 63 63 63 63 63 63 60 60 60 60 60 60 60 60 60 60 57 57 57 57 57 57 51 54 54 51 54 51 51 48 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -1.171875 2.734375 -0.390625 -2.734375 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 2.734375 -2.734375 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.7 2.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
99.891 100.513
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625
</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" >
89.588 90.0 95.0 100.0 105.0 110.0 112.062 114.125 115.0 116.187 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 362.294 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 1.854 2.389 2.67 2.76 2.657 2.657 2.701 2.76 2.873 3.023 3.178 3.338 3.503 3.674 3.85 4.032 4.218 4.407 4.6 4.794 4.99 5.186 5.382 5.577 5.772 5.964 6.155 6.343 6.53 6.714 6.896 7.076 7.253 7.428 7.601 7.771 7.939 8.105 8.268 8.428 8.585 8.74 8.891 9.038 9.181 9.319 9.452 9.578 9.698 9.809 9.911 10.003 10.082 10.147 10.197 10.231 10.248 10.25 10.249 10.243 10.23 10.212 10.189 10.16 10.126 10.088 10.044 9.997 9.945 9.89 9.83 9.767 9.701 9.632 9.56 9.485 9.408 9.328 9.246 9.162 9.077 8.989 8.9 8.81 8.718 8.625 8.531 8.437 8.341 8.245 8.148 8.051 7.954 7.856 7.758 7.66 7.562 7.464 7.366 7.269 7.172 7.075 6.978 6.882 6.786 6.691 6.596 6.502 6.409 6.316 6.224 6.133 6.043 5.953 5.864 5.776 5.689 5.603 5.518 5.433 5.349 5.267 5.185 5.104 5.025 4.946 4.868 4.791 4.715 4.64 4.566 4.493 4.421 4.349 4.279 4.21 4.142 4.074 4.008 3.942 3.878 3.814 3.752 3.69 3.629 3.569 3.51 3.452 3.394 3.338 3.282 3.228 3.174 3.121 3.068 3.017 2.966 2.916 2.867 2.819 2.771 2.725 2.679 2.633 2.589 2.545 2.502 2.459 2.418 2.377 2.336 2.296 2.257 2.219 2.181 2.144 2.107 2.071 2.036 2.001 1.967 1.933 1.9 1.867 1.835 1.804

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.76" PeakHeight="110.0" Num="3" Error="0.0">
-29.98 12.39 -2.822
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.76" EndFrequency="10.25" PeakHeight="362.294" Num="5" zHalfNm="239.848" Error="6.188">
-234.472 -19.926 12.716 -5.664 1.239
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.187" Depth="0.103"/>
<TopsideChapman PeakHeight="362.294" PeakDensity="1303505.0" PeakScaleHeight="89.305" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
