<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-20 -079 19:10:00.000"
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="1 2 0 1 0 0 0 0 0 22 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o 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" >
2026.03.20 (079) 19:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607903201910009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="35" >
<URSI ID="00" Val="11.525" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="3.550" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.704" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.098" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.950" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.100" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.600" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.810" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="140.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="237.500" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="116.078" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="130.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="104.809" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="14.505" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="446.608" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="2.676" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="354.348" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="151.974" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="268.181" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.640" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.850" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="113.988" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="53.244" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="46.445" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="64.374" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="142.440" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.360" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.510" Name="D1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="4">
<Trace Type="standard" Layer="F2" Polarization="O" Num="159">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
237.500 240.000 240.000 242.500 245.000 247.500 250.000 252.500 255.000 257.500 260.000 262.500 265.000 265.000 265.000 270.000 270.000 275.000 275.000 275.000 275.000 275.000 280.000 282.500 285.000 285.000 285.000 285.000 285.000 290.000 290.000 292.500 295.000 295.000 295.000 295.000 297.500 300.000 300.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 318.333 321.667 325.000 325.000 325.000 325.000 325.000 325.000 325.000 325.000 327.500 330.000 330.000 331.875 333.750 335.625 337.500 339.375 341.250 343.125 345.000 345.000 350.000 350.000 351.667 353.333 355.000 356.667 358.333 360.000 355.000 357.500 360.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 391.250 392.500 393.750 395.000 400.000 400.000 400.000 400.000 400.000 401.667 403.333 405.000 405.000 410.000 411.667 413.333 415.000 415.000 415.000 417.500 420.000 420.000 422.500 425.000 425.000 425.000 425.000 430.000 435.000 435.000 435.000 435.000 435.000 435.000 437.573 440.349 443.351 446.608 450.155 454.032 458.288 462.980 468.179 473.973 480.469 487.803 496.150 505.733 516.851 529.902 545.441 564.253 587.493
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 48 54 0 51 0 0 0 0 0 0 0 51 57 60 60 66 54 51 60 66 60 60 0 57 63 63 63 60 60 60 0 60 0 60 60 0 66 63 63 60 66 66 66 66 66 63 57 48 63 63 57 0 0 60 0 66 0 66 60 69 48 0 63 57 48 0 0 0 54 0 0 66 66 66 69 0 60 0 69 0 66 75 0 72 54 60 0 66 57 60 69 69 63 66 72 69 72 72 51 72 72 69 72 72 66 0 0 0 69 66 69 69 69 63 0 0 63 63 60 0 0 54 63 63 51 57 63 0 57 60 63 57 0 48 54 54 54 54 0 57 0 54 48 0 48 48 0 51 0 51 51 54 51 48 0 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 1.953125 -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 -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 1.953125 -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 -1.953125 -0.390625 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 1.953125 -1.171875 -1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="10">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
140.000 155.000 170.000 185.000 200.000 215.000 230.000 230.000 230.000 235.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 0 0 48 48 54 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 1.953125 1.171875 -2.734375 -2.734375 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.6 2.65 2.7 2.75 2.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
116.078 118.328 121.024 124.411 129.036
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 2.734375 2.734375 -1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="3">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.85 2.9 2.95
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 120.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -1.953125 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 100.0 104.809 105.0 109.528 110.0 114.246 115.0 118.965 120.0 125.0 130.0 135.0 140.0 145.0 150.0 151.974 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 354.348 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.085 2.648 2.81 2.81 2.681 2.681 2.681 2.702 2.81 2.859 3.068 3.234 3.363 3.458 3.519 3.548 3.55 3.65 3.809 3.964 4.117 4.271 4.428 4.587 4.751 4.92 5.094 5.275 5.462 5.657 5.859 6.069 6.286 6.511 6.744 6.982 7.227 7.476 7.729 7.985 8.243 8.502 8.76 9.018 9.272 9.524 9.771 10.012 10.246 10.471 10.684 10.884 11.065 11.223 11.353 11.45 11.509 11.525 11.525 11.516 11.495 11.462 11.417 11.361 11.296 11.22 11.137 11.044 10.945 10.838 10.725 10.607 10.483 10.354 10.221 10.085 9.945 9.803 9.657 9.51 9.361 9.211 9.06 8.908 8.755 8.602 8.45 8.297 8.145 7.993 7.842 7.693 7.544 7.396 7.25 7.105 6.962 6.82 6.681 6.542 6.406 6.272 6.139 6.009 5.88 5.754 5.629 5.507 5.386 5.268 5.152 5.038 4.926 4.816 4.708 4.603 4.499 4.397 4.297 4.2 4.104 4.01 3.918 3.829 3.74 3.654 3.57 3.487 3.406 3.327 3.25 3.174 3.1 3.028 2.957 2.888 2.82 2.754 2.689 2.626 2.564 2.504 2.445 2.387 2.331 2.276 2.222 2.17 2.118 2.068 2.019 1.971 1.924 1.879 1.834 1.79 1.748 1.706 1.666 1.626 1.587 1.55 1.513 1.477 1.441 1.407 1.373 1.341 1.309 1.277 1.247 1.217 1.188 1.16 1.132 1.105 1.079 1.053 1.028 1.003 0.979 0.956 0.933 0.91 0.889 0.867 0.847 0.826

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.81" PeakHeight="104.809" Num="3" Error="3.959">
-21.777 9.036 -2.068
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="2.81" EndFrequency="3.55" PeakHeight="151.974" Num="5" Error="0.0">
-34.495 1.486 0.0 0.0 0.0
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.55" EndFrequency="11.525" PeakHeight="354.348" Num="5" zHalfNm="268.181" Error="5.614">
-169.443 -37.128 4.387 -1.651 1.461
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="14.156" Depth="0.129"/>
<TopsideChapman PeakHeight="354.348" PeakDensity="1647960.6" PeakScaleHeight="64.374" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
