<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-24 -055 20:50:00.000"
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 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" >
2026.02.24 (055) 20:50:00</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">
FF202605502242050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="10.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.488" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.127" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.100" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="265.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="265.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="95.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="475.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.612" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="392.408" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="284.984" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.281" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.700" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="151.090" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="45.713" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="78.253" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="155.970" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.870" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="147">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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" >
265.000 265.000 275.000 265.000 265.000 265.000 270.000 275.000 272.500 270.000 270.000 270.000 270.000 275.000 275.000 275.000 277.500 280.000 280.833 281.667 282.500 283.333 284.167 285.000 285.833 286.667 287.500 288.333 289.167 290.000 291.111 292.222 293.333 294.444 295.556 296.667 297.778 298.889 300.000 300.000 305.000 306.250 307.500 308.750 310.000 305.000 305.000 315.000 315.000 317.500 320.000 315.000 316.538 318.077 319.615 321.154 322.692 324.231 325.769 327.308 328.846 330.385 331.923 333.462 335.000 335.000 340.000 340.000 340.000 340.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 365.000 368.333 371.667 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 410.000 410.000 415.000 415.000 417.500 420.000 420.000 425.000 425.000 430.000 430.000 435.000 437.500 440.000 440.000 445.000 450.000 450.000 455.000 455.000 460.000 460.000 465.000 470.000 470.000 475.000 475.000 480.000 490.000 490.000 495.000 500.000 505.000 510.000 515.000 520.000 530.000 535.000 540.895 547.407 554.639 562.716 571.797 582.081 593.824 607.359 623.132 641.746 664.047
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 57 66 69 66 69 57 0 63 0 0 66 63 0 57 54 60 0 0 0 0 0 54 0 0 0 48 0 66 0 0 0 0 0 0 0 0 63 0 57 0 48 0 51 63 0 48 54 0 48 0 0 60 0 0 0 0 69 0 0 54 0 0 72 72 66 63 57 63 0 51 66 72 63 0 66 63 69 66 72 72 0 0 69 75 66 72 66 69 60 69 51 66 57 72 75 69 54 66 63 69 0 63 69 66 72 69 69 69 0 60 60 0 60 66 60 63 54 54 66 63 69 69 72 63 60 69 69 66 60 0 0 60 57 63 60 57 63 63 57 54 51 51 0 45 42
</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 -0.390625 2.734375 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -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 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.953125 -1.171875 -0.390625 -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 -0.390625 -1.171875 -0.390625 -1.171875 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 2.734375 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="9">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 105.000 102.500 100.000 100.000 98.750 97.500 96.250 95.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
75 69 0 75 0 0 75 0 72
</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
</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" >
89.889 90.0 95.0 100.0 105.0 110.0 115.0 120.0 120.514 125.0 130.0 131.028 135.0 140.0 141.542 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 392.408 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.21 1.078 1.396 1.56 1.612 1.581 1.484 1.47 1.47 1.47 1.47 1.524 1.591 1.612 1.704 1.83 1.955 2.083 2.217 2.357 2.507 2.667 2.84 3.025 3.225 3.437 3.663 3.899 4.143 4.392 4.643 4.894 5.144 5.391 5.634 5.872 6.107 6.337 6.563 6.784 7.002 7.215 7.425 7.632 7.835 8.034 8.23 8.422 8.611 8.795 8.976 9.152 9.322 9.486 9.644 9.793 9.933 10.062 10.179 10.28 10.365 10.43 10.475 10.497 10.5 10.499 10.491 10.474 10.451 10.42 10.382 10.338 10.288 10.231 10.17 10.103 10.032 9.956 9.875 9.791 9.703 9.612 9.518 9.421 9.321 9.22 9.116 9.01 8.902 8.793 8.683 8.572 8.46 8.347 8.233 8.119 8.005 7.89 7.776 7.661 7.547 7.433 7.319 7.206 7.093 6.981 6.87 6.759 6.649 6.54 6.432 6.325 6.219 6.114 6.01 5.907 5.805 5.705 5.606 5.507 5.411 5.315 5.221 5.127 5.036 4.945 4.856 4.768 4.681 4.596 4.511 4.429 4.347 4.267 4.188 4.11 4.033 3.958 3.884 3.811 3.74 3.669 3.6 3.532 3.465 3.399 3.335 3.271 3.209 3.148 3.088 3.028 2.97 2.913 2.857 2.802 2.749 2.696 2.644 2.593 2.542 2.493 2.445 2.398 2.351 2.305 2.261 2.217 2.174 2.131 2.09 2.049 2.009 1.97 1.931 1.894 1.857 1.82 1.785 1.75 1.716 1.682 1.649 1.617 1.585 1.554 1.524

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.612" PeakHeight="110.0" Num="3" Error="0.0">
-28.373 10.203 -1.941
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.612" EndFrequency="10.5" PeakHeight="392.408" Num="5" zHalfNm="284.984" Error="5.327">
-243.841 -12.878 11.542 -9.361 3.672
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="31.542" Depth="0.142"/>
<TopsideChapman PeakHeight="392.408" PeakDensity="1367866.0" PeakScaleHeight="78.253" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
