<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-25 -056 17:50:00.000"
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" >
2026.02.25 (056) 17:50:00</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">
FF202605602251750009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.423" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.354" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.000" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="335.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="335.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" 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="0.600" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="545.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.120" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.233" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="372.173" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="255.159" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.423" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.700" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="146.358" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.634" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="80.948" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="201.470" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.130" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="85">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
335.000 335.000 336.875 338.750 340.625 342.500 344.375 346.250 348.125 350.000 350.000 355.000 355.000 360.000 360.000 360.000 362.857 365.714 368.571 371.429 374.286 377.143 380.000 380.000 380.000 385.000 390.000 395.000 395.000 400.000 405.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 435.000 440.000 445.000 450.000 450.000 455.000 455.000 465.000 470.000 470.000 475.000 480.000 485.000 490.000 490.000 495.000 500.000 505.000 505.000 510.000 515.000 515.000 515.000 520.000 520.000 522.500 525.000 530.000 530.000 535.000 540.000 540.000 545.000 545.000 545.000 555.000 555.000 560.000 565.000 570.000 575.000 580.000 588.548 599.168 612.720
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 51 0 0 0 0 0 54 0 51 57 48 51 51 54 54 0 0 54 0 54 0 57 48 0 48 0 51 60 57 54 57 57 51 60 57 60 57 57 54 54 57 57 54 57 57 54 54 54 54 54 54 54 54 54 54 54 54 57 57 51 57 54 57 54 0 57 54 51 0 54 51 45 54 51 48 48 48 0 45 48 45 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 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 -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 2.734375 -1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="27">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 110.000 110.000 110.000 110.000 109.167 108.333 107.500 106.667 105.833 105.000 105.000 105.000 105.000 105.000 110.000 105.000 106.111 107.222 108.333 109.444 110.556 111.667 112.778 113.889 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 0 0 48 0 48 0 51 0 60 60 60 0 0 54 0 0 0 48 0 0 0 0 0 48 48
</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 -1.171875 -1.953125 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 1.953125 1.171875 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" >
89.525 90.0 95.0 100.0 105.0 110.0 112.69 115.0 115.38 118.07 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 372.173 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.098 2.7 3.019 3.12 2.998 2.998 2.998 3.12 3.199 3.377 3.537 3.69 3.837 3.983 4.127 4.272 4.416 4.56 4.705 4.85 4.995 5.14 5.285 5.43 5.573 5.717 5.859 6.001 6.142 6.282 6.421 6.559 6.696 6.832 6.967 7.102 7.236 7.37 7.502 7.635 7.767 7.899 8.031 8.163 8.295 8.427 8.56 8.693 8.827 8.962 9.097 9.233 9.37 9.506 9.641 9.771 9.89 9.988 10.044 10.05 10.049 10.041 10.026 10.005 9.977 9.942 9.903 9.857 9.806 9.75 9.69 9.625 9.556 9.484 9.407 9.327 9.245 9.159 9.071 8.98 8.887 8.792 8.695 8.597 8.497 8.396 8.294 8.191 8.087 7.982 7.877 7.771 7.666 7.56 7.454 7.348 7.242 7.136 7.031 6.926 6.822 6.718 6.615 6.512 6.41 6.309 6.208 6.109 6.01 5.912 5.816 5.72 5.625 5.531 5.438 5.347 5.256 5.167 5.078 4.991 4.905 4.82 4.736 4.654 4.572 4.492 4.412 4.334 4.257 4.182 4.107 4.033 3.961 3.89 3.82 3.751 3.683 3.616 3.55 3.485 3.422 3.359 3.298 3.237 3.178 3.119 3.062 3.005 2.95 2.895 2.841 2.789 2.737 2.686 2.636 2.587 2.539 2.491 2.445 2.399 2.354 2.31 2.267 2.224 2.182 2.141 2.101 2.061 2.023 1.985 1.947 1.91 1.874 1.839 1.804 1.77 1.737 1.704 1.672 1.64 1.609 1.579 1.549 1.519 1.49 1.462

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.12" PeakHeight="110.0" Num="3" Error="0.0">
-30.294 12.847 -3.028
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.12" EndFrequency="10.05" PeakHeight="372.173" Num="5" zHalfNm="255.159" Error="3.84">
-211.141 -69.697 33.809 -9.823 2.749
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.07" Depth="0.122"/>
<TopsideChapman PeakHeight="372.173" PeakDensity="1253132.8" PeakScaleHeight="80.948" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
