<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 17:10:00.000"
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 1 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 100%</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" >
2026.04.05 (095) 17:10:00</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">
FF202609504051710009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="33" >
<URSI ID="00" Val="10.975" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.023" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.435" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.665" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.750" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.260" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="205.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="275.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="99.088" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="97.367" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="7.188" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="520.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.209" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.275" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="381.495" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="167.288" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="257.596" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.271" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="153.490" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="55.543" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="59.135" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="91.586" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="199.930" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.450" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.150" Name="D1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="119">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 275.000 275.000 280.000 285.000 290.000 290.000 290.000 295.000 295.000 300.000 300.000 305.000 305.000 310.000 310.000 315.000 315.000 320.000 325.000 325.000 325.000 330.000 330.000 335.000 340.000 340.000 340.000 345.000 345.000 347.500 350.000 352.500 355.000 357.500 360.000 360.000 360.000 365.000 365.000 367.500 370.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 383.333 386.667 390.000 390.000 390.000 395.000 400.000 402.500 405.000 405.000 405.000 410.000 412.500 415.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 435.000 440.000 440.000 440.000 445.000 445.000 450.000 450.000 455.000 460.000 460.000 462.500 465.000 465.000 470.000 470.000 475.000 480.000 480.000 485.000 490.000 490.000 490.000 495.000 500.000 500.000 505.000 510.000 515.000 517.500 520.000 525.000 530.000 534.688 539.842 545.535 551.858 558.921 566.861 575.852 586.119 597.953 611.744 628.019 647.518 671.301 700.958
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 57 51 0 0 51 60 69 63 66 63 69 66 69 69 72 69 72 72 60 66 66 66 66 0 51 63 66 57 60 0 45 0 0 0 57 63 63 51 54 0 57 60 60 60 60 57 57 0 57 0 0 66 69 63 66 54 0 51 60 63 54 0 45 57 66 66 66 63 69 66 63 63 54 60 66 63 63 63 63 54 42 54 0 51 57 63 60 66 60 63 60 48 57 57 57 57 63 60 45 42 0 45 48 45 51 51 48 48 48 0 48 45 45 42 0 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 -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 -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 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 1.171875 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -1.953125 -0.390625 0.390625 1.171875 0.390625 -2.734375 1.953125 1.953125 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="14">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
205.000 205.000 215.000 225.000 235.000 240.000 250.000 260.000 260.000 265.000 267.000 269.000 271.000 273.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 54 0 57 51 57 48 45 45 45 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 1.171875 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 1.953125 -0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="11">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
99.088 99.616 100.186 100.805 101.483 102.232 103.070 104.022 105.128 106.454 108.122
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 57 57 0 48 57 0 0 0 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 -0.390625 0.390625 -2.734375 2.734375 0.390625 0.390625 0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 97.367 99.673 100.0 101.98 104.286 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 167.288 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 381.495 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 3.074 3.26 3.136 3.136 3.136 3.26 3.293 3.484 3.659 3.834 4.003 4.159 4.299 4.424 4.54 4.648 4.753 4.859 4.975 5.023 5.107 5.253 5.392 5.528 5.662 5.797 5.933 6.072 6.214 6.359 6.509 6.663 6.821 6.984 7.15 7.321 7.494 7.669 7.845 8.022 8.198 8.373 8.545 8.715 8.882 9.045 9.205 9.361 9.514 9.662 9.807 9.947 10.083 10.214 10.34 10.46 10.573 10.677 10.77 10.849 10.912 10.954 10.974 10.975 10.973 10.966 10.952 10.933 10.908 10.878 10.843 10.802 10.758 10.708 10.655 10.597 10.536 10.471 10.402 10.331 10.256 10.179 10.099 10.016 9.932 9.845 9.756 9.665 9.573 9.479 9.384 9.288 9.191 9.092 8.993 8.893 8.792 8.691 8.59 8.488 8.386 8.284 8.181 8.079 7.977 7.875 7.773 7.671 7.57 7.469 7.369 7.269 7.17 7.071 6.973 6.875 6.778 6.682 6.587 6.492 6.398 6.305 6.213 6.122 6.032 5.942 5.854 5.766 5.679 5.593 5.509 5.425 5.342 5.26 5.179 5.099 5.02 4.942 4.865 4.789 4.714 4.64 4.567 4.495 4.424 4.354 4.284 4.216 4.149 4.082 4.017 3.952 3.889 3.826 3.764 3.703 3.644 3.584 3.526 3.469 3.412 3.357 3.302 3.248 3.195 3.142 3.091 3.04 2.99 2.941 2.893 2.845 2.798 2.752 2.706 2.661 2.617 2.574 2.531 2.489 2.448 2.407 2.367 2.328 2.289 2.251 2.214 2.177

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.26" PeakHeight="97.367" Num="3" Error="1.619">
-10.927 4.675 -1.115
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.26" EndFrequency="5.023" PeakHeight="167.288" Num="5" Error="0.0">
-48.44 -22.184 10.602 -4.132 1.152
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.023" EndFrequency="10.975" PeakHeight="381.495" Num="5" zHalfNm="257.596" Error="4.165">
-183.146 -36.926 7.912 -4.342 2.295
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.919" Depth="0.124"/>
<TopsideChapman PeakHeight="381.495" PeakDensity="1494424.6" PeakScaleHeight="91.586" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
