<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 13:00:00.000"
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 1 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 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" >
2026.02.22 (053) 13:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605302221300009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.125" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.273" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.467" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.919" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="265.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="305.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="530.000" 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="3.215" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.278" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="368.018" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="184.830" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="253.525" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.082" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="122.904" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="62.449" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="45.132" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="80.787" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="197.090" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.160" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="97">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
305.000 305.000 305.000 310.000 310.000 311.667 313.333 315.000 325.000 325.000 325.000 325.000 328.000 331.000 334.000 337.000 340.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 435.000 435.000 440.000 445.000 445.000 455.000 455.000 460.000 465.000 470.000 470.000 475.000 475.000 480.000 485.000 485.000 485.000 490.000 490.000 490.000 495.000 495.000 495.000 497.500 500.000 510.000 512.500 515.000 515.000 520.000 520.000 525.000 525.000 530.000 530.000 530.000 540.000 540.000 545.000 555.000 560.000 565.000 575.000 586.113 600.112 618.292
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 0 54 54 54 0 0 51 51 54 54 57 0 0 0 0 57 51 45 54 48 57 57 57 48 60 60 60 63 60 63 60 63 60 63 63 63 63 63 63 63 66 60 63 63 66 63 60 66 63 63 66 63 60 66 66 63 63 63 66 60 63 60 60 60 51 60 60 60 63 60 60 63 63 0 57 51 0 48 57 45 54 45 57 54 57 57 57 57 57 57 54 51 51 51 48 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 -1.953125 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 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 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="8">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 272.500 280.000 285.000 288.750 292.500 296.250 300.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 48 54 0 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 -0.390625 0.390625 1.953125 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" >
89.511 90.0 95.0 100.0 105.0 110.0 112.278 114.557 115.0 116.835 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 184.83 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 368.018 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.162 2.782 3.11 3.215 3.093 3.093 3.117 3.215 3.355 3.568 3.785 3.996 4.186 4.353 4.499 4.632 4.754 4.869 4.98 5.09 5.199 5.273 5.278 5.427 5.567 5.703 5.837 5.971 6.104 6.237 6.371 6.507 6.643 6.781 6.92 7.06 7.201 7.343 7.485 7.627 7.769 7.911 8.052 8.193 8.334 8.473 8.612 8.751 8.889 9.026 9.162 9.298 9.433 9.567 9.699 9.827 9.947 10.048 10.113 10.125 10.124 10.118 10.104 10.083 10.056 10.023 9.983 9.938 9.888 9.832 9.772 9.707 9.638 9.565 9.488 9.408 9.325 9.239 9.15 9.059 8.965 8.87 8.772 8.673 8.573 8.471 8.368 8.264 8.159 8.053 7.947 7.841 7.734 7.627 7.52 7.413 7.306 7.2 7.093 6.987 6.882 6.777 6.673 6.569 6.466 6.364 6.262 6.162 6.062 5.963 5.866 5.769 5.673 5.578 5.485 5.392 5.301 5.21 5.121 5.033 4.946 4.86 4.775 4.692 4.609 4.528 4.448 4.369 4.292 4.215 4.14 4.066 3.992 3.92 3.85 3.78 3.711 3.644 3.577 3.512 3.448 3.385 3.323 3.261 3.201 3.142 3.084 3.027 2.971 2.916 2.862 2.809 2.756 2.705 2.655 2.605 2.556 2.509 2.462 2.415 2.37 2.326 2.282 2.239 2.197 2.156 2.115 2.075 2.036 1.998 1.96 1.923 1.886 1.851 1.816 1.781 1.748 1.714 1.682 1.65 1.619 1.588 1.558 1.528 1.499 1.471 1.443

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.215" PeakHeight="110.0" Num="3" Error="0.0">
-30.369 12.958 -3.078
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.215" EndFrequency="5.273" PeakHeight="184.83" Num="5" Error="0.0">
-56.63 -18.428 10.413 -4.325 0.975
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.273" EndFrequency="10.125" PeakHeight="368.018" Num="5" zHalfNm="253.525" Error="3.413">
-141.955 -52.704 13.867 -3.67 1.274
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.835" Depth="0.122"/>
<TopsideChapman PeakHeight="368.018" PeakDensity="1271906.0" PeakScaleHeight="80.787" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
