<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-11 -070 21:50:00.000"
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 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" >
2026.03.11 (070) 21:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.16" 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">
FF202607003112150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="9.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.544" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.788" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.800" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.200" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="350.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="350.000" 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="0.550" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="516.044" 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="0.433" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="424.844" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="367.063" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.937" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.550" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="86.419" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="20.509" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="43.165" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="95.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.380" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="131">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
350.000 355.000 355.000 355.000 355.000 360.000 360.500 361.000 361.500 362.000 362.500 363.000 363.500 364.000 364.500 365.000 365.500 366.000 366.500 367.000 367.500 368.000 368.500 369.000 369.500 370.000 370.000 375.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 381.000 382.000 383.000 384.000 385.000 386.000 387.000 388.000 389.000 390.000 395.000 395.000 395.000 395.000 395.000 397.500 400.000 402.500 405.000 405.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 412.500 415.000 415.000 415.000 415.000 420.000 420.000 420.000 422.500 425.000 425.000 425.000 425.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 435.000 440.000 440.000 440.000 442.500 445.000 445.000 445.000 447.500 450.000 452.500 455.000 455.000 455.000 460.000 460.000 460.000 465.000 465.000 470.000 470.000 470.000 470.000 475.000 475.000 480.000 480.000 485.000 485.000 485.000 490.000 495.000 495.000 500.000 500.000 505.000 505.000 506.697 508.602 510.757 513.215 516.044 519.335 523.212 527.845 533.480 540.481 549.415 561.210
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 66 66 0 66 60 0 0 0 0 0 57 0 0 0 0 0 54 0 0 0 0 0 48 0 60 66 51 57 63 0 66 69 48 57 0 60 0 0 0 54 0 63 0 66 60 60 63 0 54 0 0 0 54 0 63 0 69 69 57 0 63 51 57 63 0 66 57 57 63 0 57 0 0 60 57 57 66 51 0 63 63 69 57 0 63 57 60 63 63 0 66 0 60 66 66 60 63 69 60 66 54 60 63 66 66 66 63 66 57 63 60 63 51 60 54 63 57 63 63 63 63 63 63 63 60 60 60 60 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 -2.734375 -0.390625 -1.953125 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -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 -1.171875 -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 2.734375 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 1.953125 -1.171875 1.953125 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -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 -1.953125 1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="26">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 114.167 113.333 112.500 111.667 110.833 110.000 110.000 109.000 108.000 107.000 106.000 105.000 105.000 106.667 108.333 110.000 111.250 112.500 113.750 115.000 116.000 117.000 118.000 119.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 0 0 63 63 0 0 0 0 51 54 0 0 66 0 0 0 0 0 0 0 51 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 -1.171875 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -1.953125 -1.171875 0.390625 1.171875 -1.953125 -0.390625 -0.390625 0.390625 1.953125 -0.390625 -0.390625 -0.390625 -1.171875 0.390625 -1.171875 -1.171875
</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" >
92.253 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 138.843 140.0 145.0 150.0 155.0 160.0 165.0 167.685 170.0 175.0 180.0 185.0 190.0 195.0 196.528 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 424.844 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.286 0.375 0.419 0.433 0.428 0.412 0.384 0.341 0.276 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.219 0.259 0.299 0.34 0.38 0.421 0.433 0.497 0.584 0.671 0.76 0.853 0.951 1.054 1.163 1.278 1.4 1.528 1.663 1.805 1.955 2.111 2.275 2.446 2.624 2.81 3.003 3.203 3.411 3.626 3.849 4.08 4.318 4.564 4.817 5.078 5.346 5.621 5.904 6.193 6.488 6.788 7.092 7.398 7.704 8.006 8.298 8.575 8.826 9.042 9.209 9.315 9.35 9.35 9.337 9.302 9.246 9.171 9.078 8.971 8.849 8.716 8.571 8.418 8.257 8.09 7.917 7.74 7.56 7.377 7.193 7.009 6.824 6.639 6.456 6.274 6.094 5.916 5.741 5.569 5.399 5.233 5.07 4.911 4.755 4.603 4.455 4.31 4.169 4.032 3.899 3.769 3.643 3.521 3.402 3.287 3.176 3.068 2.963 2.861 2.763 2.668 2.576 2.487 2.401 2.317 2.237 2.159 2.083 2.011 1.94 1.872 1.807 1.743 1.682 1.623 1.566 1.511 1.458 1.406 1.357 1.309 1.263 1.218 1.175 1.133 1.093 1.055 1.017 0.981 0.947 0.913 0.881 0.849 0.819 0.79 0.762 0.735 0.709 0.684 0.66 0.636 0.614 0.592 0.571 0.551 0.531 0.512 0.494 0.477 0.46 0.443 0.428 0.412 0.398 0.384 0.37 0.357 0.344 0.332 0.32 0.309 0.298 0.287 0.277 0.267 0.258 0.248 0.24

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.433" PeakHeight="110.0" Num="3" Error="0.0">
-21.02 3.55 -0.277
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.433" EndFrequency="9.35" PeakHeight="424.844" Num="5" zHalfNm="367.063" Error="2.794">
-204.672 -40.922 20.027 -4.025 1.276
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="86.528" Depth="0.233"/>
<TopsideChapman PeakHeight="424.844" PeakDensity="1084646.4" PeakScaleHeight="43.165" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
