<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 19:30:00.000"
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) 19:30:00</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">
FF202605702261930009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="10.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.322" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.384" 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="10.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="225.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="225.000" 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="9.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="535.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.572" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.450" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.450" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="412.961" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="274.177" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.561" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="186.523" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="57.879" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="98.481" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="211.030" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.570" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="142">
<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 10.4 10.45 10.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 225.000 227.500 230.000 232.500 235.000 236.875 238.750 240.625 242.500 244.375 246.250 248.125 250.000 250.000 252.500 255.000 255.000 260.000 265.000 265.000 265.000 265.000 268.750 272.500 276.250 280.000 281.250 282.500 283.750 285.000 290.000 291.250 292.500 293.750 295.000 295.000 300.000 302.500 305.000 307.500 310.000 312.500 315.000 317.500 320.000 320.000 325.000 325.000 327.500 330.000 332.500 335.000 335.000 335.000 340.000 340.000 340.000 350.000 350.000 350.000 355.000 355.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 395.000 395.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 435.000 435.000 440.000 440.000 450.000 450.000 455.000 455.000 465.000 465.000 470.000 475.000 475.000 480.000 485.000 490.000 490.000 495.000 500.000 500.000 505.000 510.000 512.500 515.000 515.000 520.000 522.500 525.000 530.000 530.000 535.000 535.000 545.000 545.000 550.000 560.000 565.000 571.250 577.500 583.750 590.000 595.000 602.845 611.337 620.559 630.610 641.608 653.691 667.030 681.831 698.349 716.899 737.883
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 0 0 0 48 0 0 0 0 0 0 0 48 54 0 48 57 0 57 60 63 57 0 0 0 54 0 51 0 63 57 0 48 0 0 0 57 0 0 0 0 0 0 0 45 51 48 54 0 54 0 57 63 63 60 63 60 54 63 69 63 69 63 51 63 69 63 69 63 69 63 66 63 69 66 60 69 63 57 66 57 69 63 66 66 63 66 66 63 63 63 57 57 63 63 63 60 63 63 60 60 63 60 57 60 60 51 60 54 48 0 51 60 57 48 57 57 60 60 60 57 54 54 54 54 0 0 0 48 48 51 48 48 48 48 0 45 45 0 0 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 2.734375 -1.953125 -2.734375 -2.734375 0.390625 -2.734375 1.171875 -1.171875 -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 -1.171875 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 -1.953125 -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 1.953125 -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
</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" >
89.625 90.0 95.0 100.0 105.0 110.0 115.0 115.225 120.0 120.449 125.0 125.674 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 412.961 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.231 1.727 2.227 2.489 2.572 2.459 2.448 2.448 2.448 2.556 2.572 2.681 2.808 2.937 3.07 3.208 3.353 3.504 3.663 3.828 4.001 4.18 4.363 4.551 4.74 4.93 5.119 5.306 5.49 5.672 5.85 6.024 6.195 6.363 6.526 6.687 6.845 7.0 7.152 7.301 7.449 7.594 7.737 7.878 8.018 8.156 8.292 8.427 8.56 8.692 8.823 8.952 9.08 9.207 9.332 9.454 9.575 9.693 9.808 9.92 10.026 10.127 10.22 10.304 10.376 10.433 10.474 10.496 10.5 10.5 10.495 10.485 10.47 10.451 10.427 10.399 10.367 10.33 10.29 10.246 10.198 10.148 10.094 10.037 9.977 9.914 9.849 9.782 9.712 9.64 9.566 9.49 9.413 9.334 9.253 9.171 9.088 9.004 8.919 8.832 8.745 8.657 8.569 8.48 8.39 8.3 8.21 8.119 8.028 7.937 7.846 7.755 7.664 7.573 7.483 7.392 7.302 7.212 7.122 7.033 6.944 6.856 6.768 6.68 6.594 6.507 6.422 6.336 6.252 6.168 6.085 6.003 5.921 5.84 5.76 5.68 5.601 5.523 5.446 5.37 5.294 5.219 5.145 5.072 4.999 4.927 4.857 4.787 4.717 4.649 4.581 4.515 4.449 4.383 4.319 4.255 4.193 4.131 4.07 4.009 3.95 3.891 3.833 3.775 3.719 3.663 3.608 3.554 3.5 3.447 3.395 3.344 3.293 3.243 3.194 3.146 3.098 3.051 3.004 2.958 2.913 2.869 2.825 2.781 2.739 2.697 2.655

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.572" PeakHeight="110.0" Num="3" Error="0.0">
-29.791 12.12 -2.704
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.572" EndFrequency="10.5" PeakHeight="412.961" Num="5" zHalfNm="274.177" Error="5.826">
-268.422 -34.615 26.296 -14.1 3.554
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="15.674" Depth="0.124"/>
<TopsideChapman PeakHeight="412.961" PeakDensity="1367866.0" PeakScaleHeight="98.481" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
