<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-24 -055 21:50:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o cusp, 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" >
2026.02.24 (055) 21:50:00</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">
FF202605502242150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.512" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.734" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="315.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="315.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="485.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.482" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.450" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.450" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="416.056" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="344.018" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.974" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="105.404" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="25.327" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="53.559" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="106.300" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.900" 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" >
2.4 2.45 2.5 2.55 2.6 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
320.000 315.000 316.250 317.500 318.750 320.000 320.000 320.714 321.429 322.143 322.857 323.571 324.286 325.000 325.833 326.667 327.500 328.333 329.167 330.000 331.000 332.000 333.000 334.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 341.250 342.500 343.750 345.000 346.000 347.000 348.000 349.000 350.000 350.000 350.625 351.250 351.875 352.500 353.125 353.750 354.375 355.000 360.000 360.000 360.000 360.000 361.667 363.333 365.000 365.000 366.316 367.632 368.947 370.263 371.579 372.895 374.211 375.526 376.842 378.158 379.474 380.789 382.105 383.421 384.737 386.053 387.368 388.684 390.000 395.000 396.000 397.000 398.000 399.000 400.000 405.000 406.250 407.500 408.750 410.000 410.000 415.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 425.000 426.667 428.333 430.000 435.000 440.000 440.000 440.000 445.000 445.000 450.000 450.000 450.000 455.000 460.000 460.000 460.000 465.000 470.000 470.000 475.000 480.000 480.000 485.000 487.500 490.000 490.000 485.000 500.000 500.000 500.000 505.000 510.000 515.000 519.162 523.782 528.943 534.743 541.311 548.808 557.448 567.514 579.389 593.609
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 0 0 0 0 63 0 0 0 63 0 0 63 0 0 0 0 0 63 0 66 0 0 66 66 54 0 0 0 0 54 60 0 0 0 66 0 0 51 0 66 54 0 54 0 0 0 0 0 60 57 0 57 51 0 0 66 66 0 0 60 0 0 63 0 0 0 0 0 51 0 0 0 60 0 0 0 45 0 0 57 0 57 48 0 0 0 60 66 60 69 75 75 69 72 63 69 72 0 0 72 66 54 60 66 60 69 60 69 72 66 51 63 66 63 60 69 60 48 57 57 0 60 66 0 60 51 63 66 66 66 66 66 66 0 60 60 63 45 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -2.734375 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.953125 1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -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 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.953125 -1.171875 -0.390625 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -1.953125 -1.171875 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 2.734375 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875
</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" >
91.786 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 138.177 140.0 145.0 150.0 155.0 160.0 165.0 166.353 170.0 175.0 180.0 185.0 190.0 194.53 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 416.056 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.319 0.418 0.467 0.482 0.476 0.456 0.422 0.368 0.283 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.236 0.287 0.337 0.387 0.437 0.482 0.493 0.589 0.674 0.759 0.848 0.943 1.047 1.16 1.284 1.421 1.572 1.738 1.92 2.118 2.331 2.559 2.8 3.052 3.313 3.582 3.858 4.138 4.422 4.71 4.999 5.289 5.581 5.872 6.163 6.452 6.738 7.021 7.3 7.573 7.837 8.092 8.335 8.563 8.772 8.96 9.123 9.256 9.357 9.422 9.449 9.45 9.445 9.425 9.391 9.343 9.283 9.211 9.129 9.038 8.937 8.829 8.713 8.591 8.464 8.332 8.196 8.056 7.913 7.768 7.62 7.472 7.322 7.172 7.021 6.87 6.72 6.571 6.422 6.275 6.128 5.984 5.841 5.7 5.56 5.423 5.288 5.155 5.024 4.896 4.77 4.647 4.526 4.407 4.291 4.177 4.066 3.958 3.851 3.748 3.646 3.547 3.45 3.356 3.264 3.174 3.087 3.002 2.919 2.838 2.759 2.682 2.607 2.534 2.463 2.394 2.327 2.261 2.198 2.136 2.075 2.017 1.96 1.904 1.85 1.798 1.747 1.697 1.649 1.602 1.556 1.512 1.469 1.427 1.387 1.347 1.309 1.271 1.235 1.2 1.165 1.132 1.1 1.068 1.038 1.008 0.979 0.951 0.924 0.897 0.871 0.846 0.822 0.799 0.776 0.753 0.732 0.711 0.69 0.671 0.651 0.633 0.615 0.597 0.58 0.563 0.547 0.531 0.516

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.482" PeakHeight="110.0" Num="3" Error="0.0">
-21.996 4.149 -0.367
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.482" EndFrequency="9.45" PeakHeight="416.056" Num="5" zHalfNm="344.018" Error="4.502">
-216.045 -11.205 7.047 -4.275 2.952
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="84.53" Depth="0.282"/>
<TopsideChapman PeakHeight="416.056" PeakDensity="1107971.5" PeakScaleHeight="53.559" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
