<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 01:10:00.000"
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="2 2 0 0 0 0 0 0 0 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Trace overlaps while constructing baseline</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" >
2026.02.23 (054) 01:10:00</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">
FF202605402230110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.100" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.589" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.560" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.750" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="275.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="275.000" 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="0.700" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="450.000" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.100" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="395.262" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="312.374" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.122" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="118.858" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="26.132" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="61.507" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="104.520" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.160" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="128">
<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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
290.000 285.000 280.000 280.000 285.000 285.000 280.000 275.000 275.000 275.000 275.000 275.000 282.500 290.000 287.500 285.000 290.000 285.000 280.000 275.000 275.000 280.000 280.000 285.000 285.000 285.000 287.500 290.000 292.500 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 305.000 300.000 300.000 300.000 301.250 302.500 303.750 305.000 305.000 306.000 307.000 308.000 309.000 310.000 315.000 316.667 318.333 320.000 321.667 323.333 325.000 325.000 320.000 327.500 335.000 335.000 337.000 339.000 341.000 343.000 345.000 345.000 350.000 355.000 360.000 360.000 360.000 360.000 360.000 365.000 366.250 367.500 368.750 370.000 370.000 375.000 380.000 380.000 380.000 382.500 385.000 387.500 390.000 393.750 397.500 401.250 405.000 407.500 415.000 415.000 415.000 425.000 425.000 425.000 430.000 430.000 435.000 435.000 435.000 445.000 445.000 450.000 450.000 460.000 470.000 475.000 480.000 485.000 490.000 493.821 498.065 502.805 508.133 514.167 521.056 528.996 538.248 549.167 562.246 578.197 598.084
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 0 63 66 57 57 0 57 72 0 75 72 0 60 57 0 63 0 0 66 0 75 69 0 0 0 0 0 0 57 0 0 0 0 66 0 0 54 54 57 0 0 0 0 60 54 0 0 0 0 60 57 0 0 0 60 0 60 63 54 0 60 66 0 0 0 0 54 0 57 48 48 0 0 0 63 48 0 0 0 66 69 60 54 60 60 0 57 0 60 0 0 0 60 0 54 0 60 54 63 57 63 54 57 63 57 54 60 54 63 63 63 54 60 51 0 0 54 57 57 60 63 60 54 48 0 51 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 1.171875 1.171875 0.390625 0.390625 1.171875 1.171875 1.171875 0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 0.390625 1.171875 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 1.171875 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 1.171875 1.171875 1.171875 0.390625 0.390625 0.390625 1.953125 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 1.171875 1.171875 0.390625 0.390625 0.390625 1.171875 -1.953125 1.171875 1.171875 1.171875 0.390625 0.390625 1.171875 1.953125 1.171875 1.953125 1.171875 0.390625 1.171875 1.171875 1.953125 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 1.171875 1.171875 -2.734375 -2.734375 -2.734375 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.953125 1.953125 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.841 150.0 155.0 160.0 165.0 170.0 175.0 180.0 183.681 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 220.522 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 395.262 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.333 0.317 0.293 0.262 0.22 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.206 0.226 0.247 0.268 0.289 0.31 0.331 0.352 0.354 0.44 0.52 0.605 0.701 0.818 0.97 1.186 1.533 2.122 2.841 3.468 3.998 4.465 4.886 5.273 5.633 5.971 6.29 6.591 6.875 7.143 7.396 7.634 7.855 8.061 8.25 8.422 8.576 8.711 8.827 8.924 9.0 9.054 9.088 9.1 9.1 9.095 9.078 9.052 9.015 8.969 8.914 8.851 8.78 8.703 8.619 8.529 8.434 8.334 8.23 8.122 8.011 7.896 7.779 7.66 7.539 7.416 7.292 7.167 7.041 6.915 6.789 6.663 6.537 6.411 6.286 6.161 6.038 5.915 5.794 5.673 5.554 5.437 5.32 5.206 5.092 4.981 4.871 4.763 4.656 4.552 4.449 4.348 4.248 4.151 4.055 3.961 3.869 3.778 3.69 3.603 3.518 3.435 3.353 3.273 3.195 3.119 3.044 2.971 2.899 2.829 2.761 2.694 2.628 2.564 2.502 2.441 2.381 2.323 2.266 2.211 2.156 2.103 2.052 2.001 1.952 1.904 1.857 1.811 1.766 1.722 1.68 1.638 1.597 1.558 1.519 1.481 1.445 1.409 1.374 1.339 1.306 1.274 1.242 1.211 1.181 1.151 1.123 1.095 1.067 1.041 1.015 0.989 0.965 0.94 0.917 0.894 0.872 0.85 0.829 0.808 0.788 0.768 0.749 0.73 0.712 0.694

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="9.1" PeakHeight="395.262" Num="5" zHalfNm="312.374" Error="6.83">
-207.342 47.187 -15.094 -4.005 4.514
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="110.522" Depth="0.154"/>
<TopsideChapman PeakHeight="395.262" PeakDensity="1027419.4" PeakScaleHeight="61.507" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
