<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 20:30:00.000"
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 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" >
2026.02.26 (057) 20:30:00</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">
FF202605702262030009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.395" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.790" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.450" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.450" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="250.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="250.000" 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="9.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="495.000" 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="1.940" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="406.922" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="276.162" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.365" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="181.341" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="53.286" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="94.354" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="187.810" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.890" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="139">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 250.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 256.429 257.857 259.286 260.714 262.143 263.571 265.000 270.000 270.000 275.000 276.250 277.500 278.750 280.000 280.000 280.000 282.500 285.000 287.500 290.000 290.000 292.500 295.000 295.000 296.667 298.333 300.000 300.000 300.000 305.000 305.000 306.250 307.500 308.750 310.000 310.000 315.000 315.000 320.000 320.000 322.000 324.000 326.000 328.000 330.000 330.000 335.000 335.000 335.000 340.000 340.000 340.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 380.000 385.000 385.000 390.000 390.000 395.000 400.000 400.000 400.000 405.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 435.000 435.000 445.000 445.000 450.000 450.000 455.000 460.000 460.000 465.000 470.000 475.000 475.000 480.000 485.000 490.000 495.000 495.000 500.000 505.000 510.000 515.000 520.000 527.500 535.000 540.000 548.125 556.250 564.375 572.500 580.625 588.750 596.875 605.000 616.150 628.183 641.208 655.354 670.772 687.641 706.176 726.637
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 57 0 60 63 60 54 48 0 0 0 48 0 0 63 69 69 63 0 0 0 63 0 48 0 60 0 54 60 48 54 60 0 0 63 66 66 63 66 0 66 0 69 69 69 69 66 69 0 0 0 0 66 69 60 69 72 66 69 72 69 72 63 69 72 69 72 72 72 63 69 72 69 72 66 72 69 0 63 69 60 69 63 51 63 69 63 69 69 66 69 69 69 72 69 69 69 69 66 69 69 66 66 69 66 66 66 66 63 63 63 66 63 63 60 57 57 57 57 0 57 60 0 57 0 0 0 0 54 54 51 51 51 45 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 -1.953125 -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 -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 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 1.953125 -0.390625 -0.390625 2.734375 0.390625 -2.734375 2.734375 0.390625 -2.734375 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -1.953125
</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" >
89.778 90.0 95.0 100.0 105.0 110.0 115.0 118.547 120.0 125.0 127.094 130.0 135.0 135.641 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 406.922 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.219 1.3 1.68 1.877 1.94 1.895 1.806 1.806 1.806 1.806 1.852 1.93 1.94 2.05 2.175 2.303 2.436 2.577 2.728 2.89 3.065 3.254 3.458 3.676 3.905 4.142 4.383 4.624 4.862 5.096 5.324 5.545 5.76 5.968 6.17 6.367 6.558 6.745 6.927 7.105 7.279 7.449 7.616 7.78 7.941 8.099 8.254 8.406 8.556 8.702 8.846 8.987 9.124 9.258 9.388 9.513 9.633 9.748 9.856 9.957 10.049 10.131 10.202 10.26 10.305 10.335 10.349 10.35 10.349 10.343 10.331 10.314 10.293 10.266 10.235 10.2 10.16 10.116 10.068 10.017 9.963 9.905 9.844 9.78 9.713 9.643 9.572 9.498 9.421 9.343 9.263 9.182 9.098 9.014 8.928 8.84 8.752 8.663 8.573 8.482 8.391 8.299 8.206 8.113 8.02 7.927 7.833 7.739 7.646 7.552 7.459 7.365 7.272 7.179 7.087 6.995 6.903 6.812 6.721 6.631 6.541 6.452 6.364 6.276 6.189 6.103 6.017 5.932 5.848 5.764 5.682 5.6 5.519 5.438 5.359 5.28 5.203 5.126 5.05 4.975 4.901 4.827 4.755 4.683 4.612 4.542 4.473 4.405 4.338 4.271 4.206 4.141 4.077 4.014 3.952 3.891 3.83 3.771 3.712 3.654 3.597 3.54 3.485 3.43 3.376 3.323 3.27 3.218 3.167 3.117 3.068 3.019 2.971 2.924 2.877 2.831 2.786 2.741 2.698 2.654 2.612 2.57 2.529 2.488 2.448 2.409 2.37

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.94" PeakHeight="110.0" Num="3" Error="0.0">
-28.973 10.99 -2.239
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.94" EndFrequency="10.35" PeakHeight="406.922" Num="5" zHalfNm="276.162" Error="6.569">
-271.163 -6.874 15.531 -12.783 4.008
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="25.641" Depth="0.134"/>
<TopsideChapman PeakHeight="406.922" PeakDensity="1329063.2" PeakScaleHeight="94.354" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
