<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 16:10:00.000"
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" >
2026.02.23 (054) 16:10:00</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">
FF202605402231610009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.489" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.386" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.350" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="330.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="330.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="9.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="500.000" 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="3.362" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.347" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="368.856" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="258.239" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.801" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.300" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="141.514" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="49.097" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="80.361" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="191.780" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.200" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="102">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.55 10.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 338.000 341.000 344.000 347.000 350.000 350.000 350.000 350.000 350.000 350.000 355.000 357.500 360.000 360.000 360.000 360.000 362.500 365.000 367.500 370.000 370.000 373.333 376.667 380.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 400.000 405.000 410.000 410.000 410.000 415.000 415.000 420.000 420.000 420.000 425.000 425.000 430.000 430.000 435.000 435.000 435.000 440.000 445.000 445.000 445.000 450.000 450.000 455.000 455.000 460.000 465.000 465.000 470.000 470.000 475.000 475.000 475.000 480.000 480.000 485.000 490.000 490.000 495.000 495.000 500.000 500.000 510.000 515.000 515.000 520.000 525.000 530.000 540.000 545.000 550.000 560.000 565.000 575.000 585.199 596.647 609.589 624.338
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 54 54 54 57 54 51 0 0 0 0 48 51 54 54 51 48 54 0 54 57 54 51 0 0 0 57 57 0 0 48 54 57 51 57 48 54 57 51 57 57 57 60 57 60 54 57 60 57 60 51 60 60 57 60 54 60 54 57 57 57 54 57 57 57 54 57 57 57 51 57 51 57 48 57 57 54 57 57 51 54 51 54 54 51 48 48 51 51 51 48 51 48 45 48 48 45 45 42 42 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 -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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="22">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 120.000 120.000 120.000 117.500 115.000 115.000 115.000 115.000 115.000 113.333 111.667 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 0 54 54 57 57 0 57 54 0 0 0 63 63 63 63 63 0 0 63 45
</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
</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" >
89.488 90.0 95.0 100.0 105.0 110.0 111.663 113.327 114.99 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 368.856 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.262 2.91 3.252 3.362 3.239 3.239 3.362 3.362 3.545 3.705 3.854 3.995 4.133 4.268 4.402 4.535 4.668 4.801 4.934 5.068 5.204 5.34 5.478 5.617 5.757 5.898 6.042 6.186 6.332 6.48 6.629 6.779 6.931 7.084 7.238 7.394 7.551 7.709 7.868 8.029 8.19 8.352 8.515 8.679 8.843 9.007 9.172 9.335 9.497 9.658 9.815 9.967 10.112 10.247 10.367 10.469 10.544 10.589 10.6 10.6 10.594 10.581 10.56 10.532 10.498 10.457 10.411 10.358 10.3 10.238 10.17 10.098 10.021 9.941 9.857 9.77 9.679 9.586 9.49 9.392 9.291 9.189 9.085 8.979 8.872 8.763 8.654 8.544 8.432 8.321 8.209 8.096 7.984 7.871 7.759 7.646 7.534 7.422 7.311 7.2 7.089 6.98 6.871 6.762 6.655 6.548 6.442 6.337 6.234 6.131 6.029 5.928 5.829 5.73 5.633 5.537 5.442 5.348 5.255 5.164 5.074 4.985 4.897 4.811 4.726 4.642 4.559 4.477 4.397 4.318 4.24 4.163 4.088 4.014 3.941 3.869 3.798 3.728 3.66 3.592 3.526 3.461 3.397 3.334 3.272 3.212 3.152 3.093 3.035 2.979 2.923 2.868 2.815 2.762 2.71 2.659 2.609 2.56 2.512 2.464 2.418 2.372 2.327 2.283 2.24 2.198 2.156 2.115 2.075 2.036 1.997 1.959 1.922 1.885 1.849 1.814 1.779 1.745 1.712 1.68 1.647 1.616 1.585 1.555 1.525 1.496

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.362" PeakHeight="110.0" Num="3" Error="0.0">
-30.48 13.121 -3.153
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.362" EndFrequency="10.6" PeakHeight="368.856" Num="5" zHalfNm="258.239" Error="4.228">
-211.068 -60.534 18.311 -1.756 1.181
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.99" Depth="0.123"/>
<TopsideChapman PeakHeight="368.856" PeakDensity="1394044.6" PeakScaleHeight="80.361" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
