<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 21:40:00.000"
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 F2x 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" >
2026.02.21 (052) 21:40:00</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">
FF202605202212140009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="9.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.552" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.884" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.000" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.100" 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="34" Val="103.000" Name="h`Es" 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="9.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="505.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.620" 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="403.936" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="334.387" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.033" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.050" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="101.671" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="26.035" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="51.376" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="104.650" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.770" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="2.650" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="143">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
315.000 320.000 320.000 320.000 320.000 320.000 320.000 321.250 322.500 323.750 325.000 325.000 325.000 325.000 325.000 325.000 323.750 322.500 321.250 320.000 325.000 326.000 327.000 328.000 329.000 330.000 331.000 332.000 333.000 334.000 335.000 335.000 335.000 335.000 335.000 330.000 331.071 332.143 333.214 334.286 335.357 336.429 337.500 338.571 339.643 340.714 341.786 342.857 343.929 345.000 347.500 350.000 352.500 355.000 355.000 355.000 360.000 360.000 360.000 361.000 362.000 363.000 364.000 365.000 365.000 367.500 370.000 372.500 375.000 375.000 375.000 375.000 380.000 380.000 381.000 382.000 383.000 384.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 396.667 398.333 400.000 400.000 405.000 410.000 410.000 410.000 415.000 416.250 417.500 418.750 420.000 425.000 427.500 430.000 432.500 435.000 435.000 435.000 435.000 440.000 440.000 445.000 445.000 447.500 450.000 450.000 455.000 455.000 460.000 460.000 465.000 465.000 470.000 470.000 470.000 470.000 480.000 480.000 480.000 482.500 485.000 490.000 495.000 495.000 500.000 505.000 505.000 510.000 515.555 521.659 528.397 535.874 544.217 553.588 564.187 576.274
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 57 0 0 66 63 0 0 0 57 60 0 69 0 63 0 0 0 60 51 0 0 0 54 0 0 54 0 0 57 51 0 0 57 0 0 0 0 0 0 0 0 63 0 0 0 0 0 75 0 0 0 78 63 78 75 0 69 0 0 0 0 51 0 0 0 0 60 69 72 72 66 69 0 0 0 0 69 66 54 66 63 63 57 0 0 57 63 66 60 66 72 60 0 0 0 60 54 0 0 0 51 51 63 72 66 66 66 66 0 57 60 57 60 60 66 63 72 63 72 75 75 60 63 60 0 51 60 57 60 60 54 63 57 45 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 2.734375 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.171875 -1.171875 -1.171875 -2.734375 -1.171875 1.953125 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -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 -1.953125 -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 -1.171875 -1.171875 -1.953125 -1.171875 2.734375 -1.953125 -1.953125 -1.953125 0.390625 -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 -2.734375 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -2.734375 2.734375 0.390625 -2.734375 -1.953125 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="20">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.05 2.1 2.15 2.2 2.25 2.3 2.35 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 101.667 98.333 95.000 96.667 98.333 100.000 111.667 123.333 135.000 130.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 0 0 0 0 51 51 0 0 54 0 0 51 0 0 51 60
</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 -2.734375 -0.390625 -2.734375 2.734375 0.390625 -0.390625
</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" >
91.026 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 136.235 140.0 145.0 150.0 155.0 160.0 162.47 165.0 170.0 175.0 180.0 185.0 188.705 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 403.936 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.411 0.537 0.6 0.62 0.611 0.584 0.536 0.461 0.339 0.294 0.294 0.294 0.294 0.294 0.294 0.294 0.325 0.388 0.45 0.512 0.574 0.62 0.658 0.769 0.868 0.967 1.069 1.177 1.294 1.422 1.562 1.715 1.884 2.069 2.27 2.488 2.72 2.966 3.224 3.49 3.764 4.043 4.327 4.613 4.901 5.191 5.481 5.772 6.062 6.352 6.642 6.93 7.215 7.498 7.777 8.05 8.315 8.571 8.814 9.041 9.245 9.423 9.568 9.673 9.735 9.75 9.75 9.737 9.708 9.663 9.604 9.531 9.447 9.351 9.245 9.13 9.007 8.877 8.74 8.598 8.452 8.301 8.147 7.991 7.832 7.672 7.511 7.349 7.187 7.025 6.864 6.703 6.544 6.386 6.23 6.075 5.923 5.772 5.624 5.479 5.335 5.195 5.056 4.921 4.788 4.658 4.531 4.407 4.285 4.166 4.05 3.936 3.826 3.718 3.612 3.51 3.409 3.312 3.217 3.124 3.034 2.947 2.861 2.778 2.698 2.619 2.543 2.468 2.396 2.326 2.258 2.191 2.127 2.064 2.003 1.944 1.887 1.831 1.777 1.724 1.673 1.624 1.575 1.529 1.483 1.439 1.396 1.355 1.315 1.276 1.238 1.201 1.165 1.13 1.096 1.064 1.032 1.001 0.971 0.942 0.914 0.887 0.86 0.835 0.81 0.786 0.762 0.739 0.717 0.696 0.675 0.655 0.635 0.616 0.598 0.58 0.563 0.546 0.529 0.514 0.498 0.483 0.469 0.455 0.441 0.428

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.62" PeakHeight="110.0" Num="3" Error="0.0">
-23.892 5.538 -0.62
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.62" EndFrequency="9.75" PeakHeight="403.936" Num="5" zHalfNm="334.387" Error="4.706">
-204.671 -18.775 10.428 -5.772 3.559
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="78.705" Depth="0.326"/>
<TopsideChapman PeakHeight="403.936" PeakDensity="1179435.5" PeakScaleHeight="51.376" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
