<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-24 -055 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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 100%</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) 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">
FF202605502241930009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="10.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.493" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.553" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.450" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.600" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.710" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="300.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="300.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="96.896" Name="h`E" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="505.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.574" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="366.821" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="258.906" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.561" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.750" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="142.458" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="43.641" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="76.689" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="175.260" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.340" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="100">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
300.000 301.250 302.500 303.750 305.000 305.000 307.143 309.286 311.429 313.571 315.714 317.857 320.000 320.000 322.500 325.000 327.500 330.000 335.000 335.000 335.000 335.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 380.000 385.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 435.000 435.000 440.000 445.000 445.000 447.500 450.000 455.000 460.000 460.000 462.500 465.000 470.000 475.000 480.000 480.000 485.000 485.000 490.000 490.000 495.000 500.000 505.000 505.000 510.000 515.000 520.000 525.000 530.000 536.250 542.500 548.750 555.000 563.312 572.542 582.849 594.435 607.553
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 60 0 0 51 0 0 0 0 66 66 45 0 0 54 51 0 66 60 63 69 69 72 72 72 72 72 75 75 72 75 75 66 51 51 63 66 72 69 0 60 63 66 60 69 66 69 66 72 72 75 72 63 63 57 60 57 51 45 54 63 63 54 51 0 48 57 51 54 45 54 54 51 48 57 48 60 57 63 63 63 60 63 57 0 0 0 51 0 0 0 54 60 57 54 51 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 -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 -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 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 2.734375 -0.390625 -0.390625 2.734375 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="3">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.6 2.65 2.7
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
96.896 99.220 103.030
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 63 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="35">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 106.667 103.333 100.000 100.000 95.000 100.000 105.000 110.000 95.000 100.000 105.000 104.167 103.333 102.500 101.667 100.833 100.000 98.333 96.667 95.000 100.000 105.000 104.000 103.000 102.000 101.000 100.000 105.000 100.000 100.000 102.500 105.000 107.500 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 66 69 57 0 0 54 63 69 60 0 0 0 0 0 69 0 0 57 72 60 0 0 0 0 63 66 0 0 0 0 0 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 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
</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" >
89.598 90.0 95.0 100.0 105.0 110.0 115.0 115.215 120.0 120.43 125.0 125.645 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 366.821 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.233 1.82 2.346 2.622 2.71 2.591 2.58 2.58 2.58 2.694 2.71 2.878 3.048 3.207 3.363 3.518 3.674 3.832 3.992 4.156 4.323 4.493 4.666 4.84 5.017 5.194 5.372 5.551 5.729 5.907 6.083 6.259 6.433 6.606 6.778 6.948 7.117 7.284 7.451 7.615 7.779 7.942 8.104 8.265 8.425 8.584 8.742 8.899 9.055 9.21 9.362 9.512 9.658 9.797 9.928 10.045 10.143 10.213 10.247 10.25 10.248 10.239 10.222 10.197 10.164 10.125 10.08 10.028 9.971 9.908 9.84 9.767 9.69 9.608 9.523 9.434 9.342 9.247 9.149 9.048 8.946 8.841 8.735 8.627 8.517 8.407 8.295 8.183 8.07 7.957 7.843 7.729 7.615 7.501 7.387 7.273 7.16 7.047 6.935 6.823 6.712 6.602 6.492 6.384 6.276 6.169 6.064 5.959 5.856 5.754 5.652 5.552 5.454 5.356 5.26 5.165 5.071 4.979 4.888 4.798 4.71 4.622 4.536 4.452 4.369 4.287 4.206 4.127 4.049 3.972 3.896 3.822 3.749 3.677 3.606 3.537 3.469 3.402 3.336 3.272 3.208 3.146 3.084 3.024 2.965 2.907 2.85 2.795 2.74 2.686 2.633 2.581 2.53 2.481 2.432 2.384 2.336 2.29 2.245 2.2 2.157 2.114 2.072 2.031 1.99 1.951 1.912 1.874 1.837 1.8 1.764 1.729 1.694 1.661 1.627 1.595 1.563 1.532 1.501 1.471 1.442 1.413 1.384 1.357 1.329 1.303 1.277

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.71" PeakHeight="110.0" Num="3" Error="0.0">
-29.931 12.32 -2.791
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.71" EndFrequency="10.25" PeakHeight="366.821" Num="5" zHalfNm="258.906" Error="3.775">
-211.794 -47.819 23.969 -8.4 2.868
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="15.645" Depth="0.13"/>
<TopsideChapman PeakHeight="366.821" PeakDensity="1303505.0" PeakScaleHeight="76.689" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
