<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 15:50:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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) 15:50:00</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">
FF202609003311550009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.497" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.847" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.450" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.900" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.010" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="305.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="305.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="94.373" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="500.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.375" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.450" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.450" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.353" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="362.259" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="247.118" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.614" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="151.150" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="47.636" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="82.824" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="186.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.390" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="99">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 320.000 322.500 325.000 327.500 330.000 330.000 330.000 335.000 335.000 337.500 340.000 340.000 345.000 345.000 350.000 355.000 355.000 355.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 435.000 440.000 440.000 445.000 450.000 455.000 455.000 460.000 465.000 465.000 475.000 475.000 480.000 480.000 490.000 490.000 495.000 500.000 500.000 510.000 515.000 515.000 520.000 525.000 535.000 540.000 545.000 550.000 560.000 569.984 581.744 595.799 612.894 634.135
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 0 48 51 0 51 51 51 51 0 54 0 0 0 48 54 0 54 0 54 51 48 57 51 0 54 45 57 51 0 57 60 57 0 51 60 60 54 60 54 60 60 57 60 51 57 48 57 60 57 60 54 60 57 60 54 60 54 60 57 60 57 57 57 57 57 60 60 57 60 60 60 60 60 60 57 60 60 57 54 57 57 57 54 54 54 54 54 54 54 54 51 51 48 48 48 48 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 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 2.734375 -0.390625 -0.390625 0.390625 -0.390625 -1.171875 -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 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="3">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.9 2.95 3.0
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
94.373 94.900 95.467
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 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" >
89.545 90.0 95.0 100.0 105.0 110.0 111.613 113.226 114.839 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 362.259 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.023 2.605 2.912 3.01 2.9 2.9 3.01 3.016 3.196 3.359 3.513 3.664 3.813 3.963 4.114 4.267 4.421 4.578 4.738 4.899 5.063 5.228 5.395 5.563 5.732 5.902 6.072 6.241 6.411 6.58 6.748 6.916 7.083 7.249 7.413 7.577 7.74 7.902 8.063 8.222 8.38 8.538 8.693 8.848 9.001 9.151 9.3 9.446 9.587 9.725 9.855 9.978 10.089 10.186 10.264 10.319 10.347 10.35 10.349 10.341 10.327 10.306 10.278 10.245 10.205 10.16 10.11 10.055 9.996 9.932 9.863 9.791 9.716 9.637 9.554 9.469 9.381 9.291 9.199 9.104 9.008 8.909 8.81 8.709 8.606 8.503 8.399 8.294 8.189 8.083 7.977 7.87 7.764 7.657 7.55 7.444 7.338 7.232 7.126 7.021 6.916 6.812 6.709 6.606 6.505 6.403 6.303 6.204 6.105 6.008 5.911 5.815 5.721 5.627 5.534 5.443 5.352 5.263 5.175 5.088 5.002 4.917 4.833 4.75 4.669 4.589 4.509 4.431 4.354 4.278 4.204 4.13 4.058 3.986 3.916 3.847 3.779 3.711 3.645 3.581 3.517 3.454 3.392 3.331 3.271 3.212 3.154 3.097 3.042 2.986 2.932 2.879 2.827 2.776 2.725 2.675 2.627 2.579 2.532 2.485 2.44 2.395 2.351 2.308 2.266 2.224 2.183 2.143 2.104 2.065 2.027 1.99 1.953 1.917 1.882 1.847 1.813 1.779 1.746 1.714 1.682 1.651 1.621 1.591 1.561 1.532

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.01" PeakHeight="110.0" Num="3" Error="0.0">
-30.203 12.715 -2.967
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.01" EndFrequency="10.35" PeakHeight="362.259" Num="5" zHalfNm="247.118" Error="3.539">
-218.569 -44.508 19.416 -5.968 2.209
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.839" Depth="0.11"/>
<TopsideChapman PeakHeight="362.259" PeakDensity="1329063.2" PeakScaleHeight="82.824" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
