<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 20:50:00.000"
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="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) 20:50:00</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">
FF202605702262050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.450" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.356" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.650" 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="9.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" 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="1.604" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="405.085" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="283.884" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.282" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="170.391" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="49.852" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="88.631" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="170.140" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.070" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="155">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 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" >
250.000 250.000 250.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 255.000 255.000 257.500 260.000 260.000 260.000 265.000 265.000 265.000 265.000 265.000 265.000 265.000 266.500 268.000 269.500 271.000 272.500 274.000 275.500 277.000 278.500 280.000 280.000 280.000 280.000 285.000 285.000 290.000 290.000 290.000 290.000 290.000 295.000 296.111 297.222 298.333 299.444 300.556 301.667 302.778 303.889 305.000 305.000 305.000 305.000 305.000 310.000 315.000 317.500 320.000 315.000 320.000 320.000 320.000 321.250 322.500 323.750 325.000 330.000 330.000 335.000 335.000 335.000 340.000 340.000 340.000 345.000 346.667 348.333 350.000 350.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 370.000 370.000 370.000 370.000 372.500 375.000 380.000 385.000 385.000 385.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 435.000 435.000 440.000 445.000 445.000 450.000 450.000 455.000 455.000 460.000 460.000 465.000 470.000 470.000 480.000 485.000 485.000 490.000 490.000 500.000 505.000 510.000 515.000 520.000 525.000 530.000 537.500 545.000 552.764 561.210 570.433 580.546 591.684 604.010 617.726 633.081 650.386 670.040 692.555 718.604
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 57 60 60 63 60 63 66 66 66 63 66 0 69 0 66 66 0 63 60 0 0 57 0 0 0 0 0 0 60 0 0 0 0 66 0 66 66 0 0 48 0 57 63 0 0 0 0 0 0 0 0 66 0 66 0 66 0 60 0 51 69 66 69 69 0 0 0 69 69 69 63 66 69 63 69 69 63 48 0 63 69 60 66 69 63 69 60 69 57 66 69 66 0 66 69 63 69 72 69 60 69 60 69 63 69 66 69 63 69 66 69 66 60 66 60 66 63 54 66 60 69 66 66 66 63 66 66 66 63 60 66 66 66 63 63 0 60 63 0 60 0 57 0 0 0 54 54 54 51 0 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 -0.390625 -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 -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 -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 -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 -2.734375 -0.390625 -0.390625 2.734375 -0.390625 -1.953125 -0.390625 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -1.171875 1.171875
</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" >
89.893 90.0 95.0 100.0 105.0 110.0 115.0 120.0 120.567 125.0 130.0 131.133 135.0 140.0 141.7 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 405.085 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.209 1.073 1.389 1.552 1.604 1.573 1.476 1.461 1.461 1.461 1.461 1.513 1.581 1.604 1.694 1.82 1.943 2.067 2.195 2.33 2.473 2.627 2.794 2.974 3.17 3.381 3.608 3.848 4.098 4.354 4.613 4.871 5.126 5.377 5.621 5.859 6.091 6.317 6.537 6.751 6.96 7.164 7.363 7.557 7.746 7.932 8.113 8.289 8.461 8.629 8.792 8.951 9.104 9.252 9.393 9.529 9.657 9.777 9.888 9.99 10.081 10.16 10.227 10.28 10.318 10.342 10.35 10.35 10.347 10.338 10.322 10.301 10.275 10.243 10.206 10.165 10.118 10.068 10.013 9.955 9.892 9.827 9.758 9.685 9.61 9.533 9.453 9.37 9.286 9.199 9.111 9.021 8.929 8.837 8.742 8.647 8.551 8.454 8.357 8.259 8.16 8.061 7.962 7.862 7.762 7.663 7.563 7.463 7.364 7.265 7.166 7.068 6.97 6.872 6.775 6.679 6.583 6.488 6.394 6.3 6.207 6.115 6.024 5.933 5.844 5.755 5.667 5.58 5.494 5.409 5.325 5.242 5.159 5.078 4.998 4.918 4.84 4.763 4.686 4.611 4.537 4.463 4.391 4.32 4.249 4.18 4.111 4.044 3.977 3.911 3.847 3.783 3.72 3.658 3.598 3.538 3.478 3.42 3.363 3.306 3.251 3.196 3.142 3.089 3.037 2.986 2.935 2.885 2.836 2.788 2.741 2.694 2.648 2.603 2.559 2.515 2.472 2.43 2.388 2.347 2.307 2.267 2.228 2.19 2.152 2.115 2.079

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.604" PeakHeight="110.0" Num="3" Error="0.0">
-28.355 10.181 -1.933
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.604" EndFrequency="10.35" PeakHeight="405.085" Num="5" zHalfNm="283.884" Error="6.791">
-266.832 1.521 6.812 -9.061 4.175
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="31.7" Depth="0.143"/>
<TopsideChapman PeakHeight="405.085" PeakDensity="1329063.2" PeakScaleHeight="88.631" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
