<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-21 -080 01:30:00.000"
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="2 2 0 0 0 0 0 0 0 55 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 20% PACIFIC flags: Moderate F-spread, F2o cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2, Trace overlaps while constructing baseline</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" >
2026.03.21 (080) 01:30:00</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">
FF202608003210130009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="4.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.411" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="10.969" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="435.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="435.000" Name="h`F2" 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="1.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="4.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="517.067" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="459.612" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="382.456" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.752" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="112.485" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.441" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="58.354" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="118.940" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.680" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="45">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 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 4.5 4.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
435.000 435.000 435.000 435.000 435.000 440.000 441.000 442.000 443.000 444.000 445.000 446.000 447.000 448.000 449.000 450.000 452.500 455.000 457.500 460.000 461.667 463.333 465.000 466.667 468.333 470.000 471.667 480.000 480.000 483.129 486.563 490.347 494.539 499.209 504.443 510.349 517.067 524.776 533.712 544.194 556.661 571.737 590.335 613.853 644.540
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0 66 57 63 66 0 72 69 69 66 72 0 72 63 66 63 60 0 69 0 63 66 0 69 0 69 66 60 0 57 60 54 0 54 0 0 0 0 0 0 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -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="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 147.247 150.0 155.0 160.0 165.0 170.0 175.0 180.0 184.494 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 221.741 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 459.612 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.334 0.317 0.295 0.264 0.223 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.202 0.223 0.243 0.264 0.285 0.305 0.326 0.347 0.354 0.377 0.416 0.462 0.515 0.572 0.634 0.699 0.767 0.837 0.91 0.984 1.061 1.139 1.22 1.303 1.388 1.476 1.567 1.661 1.757 1.857 1.96 2.066 2.175 2.288 2.403 2.522 2.644 2.768 2.895 3.023 3.153 3.284 3.414 3.542 3.669 3.792 3.909 4.021 4.125 4.22 4.305 4.379 4.44 4.489 4.523 4.544 4.55 4.55 4.546 4.536 4.521 4.5 4.474 4.443 4.408 4.369 4.326 4.279 4.23 4.178 4.124 4.067 4.008 3.948 3.886 3.824 3.76 3.695 3.629 3.563 3.497 3.43 3.364 3.297 3.231 3.165 3.099 3.034 2.969 2.905 2.842 2.779 2.717 2.656 2.595 2.536 2.477 2.419 2.363 2.307 2.252 2.198 2.146 2.094 2.043 1.993 1.944 1.897 1.85 1.804 1.759 1.715 1.672 1.63 1.589 1.549 1.51 1.472 1.434 1.398 1.362 1.327 1.293 1.26 1.228 1.196 1.165 1.135 1.106 1.077 1.05 1.022 0.996 0.97 0.945 0.92 0.896 0.873 0.85 0.828 0.806 0.785 0.765 0.745 0.725 0.706 0.688 0.67 0.652 0.635 0.618 0.602 0.586 0.571 0.556 0.541 0.527 0.513 0.5 0.487 0.474 0.461 0.449 0.437 0.426 0.415

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="4.55" PeakHeight="459.612" Num="5" zHalfNm="382.456" Error="3.792">
-225.649 -19.172 8.375 0.195 -1.62
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="111.741" Depth="0.154"/>
<TopsideChapman PeakHeight="459.612" PeakDensity="256854.84" PeakScaleHeight="58.354" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
