<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 22:00:00.000"
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 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, Unidentified traces above foF2</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" >
2026.02.21 (052) 22:00:00</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">
FF202605202212200009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.601" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.630" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="350.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="350.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.982" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.396" 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="412.515" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="348.899" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.911" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="93.984" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="19.235" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="47.577" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="98.190" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.680" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="105">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
350.000 350.000 350.000 350.000 350.000 350.000 351.250 352.500 353.750 355.000 355.000 360.000 360.000 360.000 360.000 360.000 370.000 367.500 365.000 365.000 375.000 365.000 365.000 365.000 375.000 370.000 370.000 375.000 377.500 380.000 380.000 380.000 385.000 385.000 385.000 385.000 385.000 386.250 387.500 388.750 390.000 390.000 392.500 395.000 395.000 396.667 398.333 400.000 400.000 402.500 405.000 405.000 405.000 405.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 427.500 430.000 430.000 430.000 432.000 434.000 436.000 438.000 440.000 440.000 442.500 445.000 447.500 450.000 450.000 455.000 455.000 455.000 455.000 455.000 460.000 465.000 465.000 470.000 470.000 475.000 475.000 477.500 480.000 485.000 487.759 490.982 494.797 499.382 504.997 512.034 521.110 533.263 550.376 576.263
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 0 0 0 0 63 0 54 0 63 60 57 0 0 0 69 57 0 69 0 54 60 51 48 54 60 60 66 0 60 63 51 54 0 60 0 0 0 0 0 66 0 0 66 63 0 0 51 60 0 57 54 0 63 63 60 60 57 57 63 60 57 66 48 51 0 57 54 60 0 0 0 0 63 60 0 0 0 57 51 48 57 63 60 63 63 63 57 60 66 66 69 51 72 66 54 0 0 0 0 0 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 -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 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 -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 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 1.171875 1.171875 -1.171875 -1.171875 -0.390625 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" >
92.731 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.381 140.0 145.0 150.0 155.0 160.0 165.0 168.763 170.0 175.0 180.0 185.0 190.0 195.0 198.144 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 412.515 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.262 0.343 0.383 0.396 0.392 0.379 0.355 0.32 0.269 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.208 0.242 0.275 0.308 0.342 0.375 0.396 0.422 0.495 0.576 0.664 0.762 0.869 0.985 1.111 1.246 1.391 1.545 1.709 1.881 2.062 2.251 2.448 2.653 2.866 3.087 3.315 3.549 3.791 4.04 4.295 4.555 4.822 5.093 5.369 5.649 5.931 6.214 6.498 6.779 7.056 7.326 7.585 7.829 8.053 8.253 8.422 8.555 8.647 8.694 8.7 8.698 8.68 8.645 8.594 8.529 8.451 8.361 8.261 8.151 8.032 7.906 7.774 7.636 7.493 7.347 7.197 7.045 6.891 6.736 6.58 6.424 6.268 6.113 5.958 5.805 5.654 5.504 5.356 5.21 5.066 4.925 4.786 4.65 4.517 4.386 4.259 4.134 4.012 3.893 3.777 3.663 3.553 3.445 3.34 3.238 3.139 3.043 2.949 2.857 2.769 2.683 2.599 2.518 2.439 2.362 2.288 2.216 2.146 2.078 2.012 1.949 1.887 1.827 1.769 1.712 1.658 1.605 1.554 1.504 1.456 1.409 1.364 1.321 1.278 1.237 1.198 1.159 1.122 1.086 1.051 1.017 0.985 0.953 0.922 0.893 0.864 0.836 0.809 0.783 0.758 0.733 0.71 0.687 0.665 0.643 0.623 0.603 0.583 0.564 0.546 0.528 0.511 0.495 0.479 0.463 0.449 0.434 0.42 0.406 0.393 0.381 0.368 0.356 0.345 0.334 0.323 0.313 0.302

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.396" PeakHeight="110.0" Num="3" Error="0.0">
-20.107 3.049 -0.211
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.396" EndFrequency="8.7" PeakHeight="412.515" Num="5" zHalfNm="348.899" Error="1.22">
-204.803 -19.056 12.636 -3.903 0.755
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="88.144" Depth="0.196"/>
<TopsideChapman PeakHeight="412.515" PeakDensity="939081.9" PeakScaleHeight="47.577" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
