<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 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="2 2 0 0 0 0 0 0 0 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2</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" >
2026.04.01 (091) 19:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609104011910009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="10.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.804" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.306" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="245.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="245.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="451.984" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.641" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="335.724" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="265.437" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.318" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="91.566" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="30.905" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="50.213" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="127.990" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.020" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="134">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
245.000 245.000 245.000 248.333 251.667 255.000 258.333 261.667 265.000 265.000 265.000 268.750 272.500 276.250 280.000 282.500 285.000 285.000 285.000 287.500 290.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 305.000 306.500 308.000 309.500 311.000 312.500 314.000 315.500 317.000 318.500 320.000 320.000 320.000 323.333 326.667 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 342.500 345.000 345.000 345.000 346.667 348.333 350.000 350.000 355.000 355.000 355.000 358.333 361.667 365.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 375.000 380.000 380.000 380.000 380.000 380.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 397.500 400.000 400.000 400.000 405.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 427.000 429.000 431.000 433.000 435.000 435.000 435.000 435.000 435.000 435.000 440.000 440.000 440.000 440.544 441.159 441.858 442.661 443.592 444.686 445.989 447.566 449.515 451.984 455.215 459.625 466.000 476.034 494.142
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 48 0 48 0 45 0 57 51 60 0 0 0 54 0 48 0 60 51 57 63 63 60 60 57 60 60 57 0 0 0 0 0 0 0 0 0 0 69 66 60 0 0 63 66 0 69 66 0 69 66 63 69 69 0 66 66 63 0 0 69 69 63 66 66 0 0 51 60 63 66 69 66 69 0 66 69 57 63 69 69 72 0 57 66 69 60 66 72 60 66 69 69 66 57 63 69 60 66 72 69 69 69 63 66 0 0 0 0 57 60 0 63 66 57 63 0 63 57 63 45 63 57 63 0 63 57 0 63 60 42 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.953125 0.390625 -1.171875 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -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 1.953125 1.953125
</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" >
89.611 90.0 95.0 100.0 105.0 110.0 114.891 115.0 119.781 120.0 124.672 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 335.724 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.232 1.774 2.286 2.555 2.641 2.518 2.518 2.518 2.523 2.641 2.649 2.774 2.899 3.026 3.154 3.285 3.42 3.558 3.7 3.847 3.998 4.154 4.314 4.479 4.648 4.821 4.999 5.18 5.365 5.554 5.745 5.94 6.137 6.337 6.539 6.743 6.95 7.159 7.371 7.585 7.801 8.021 8.243 8.469 8.699 8.933 9.171 9.414 9.66 9.906 10.143 10.345 10.448 10.45 10.443 10.417 10.372 10.312 10.236 10.146 10.044 9.929 9.805 9.671 9.529 9.38 9.225 9.064 8.899 8.731 8.559 8.385 8.209 8.032 7.855 7.677 7.5 7.323 7.147 6.973 6.8 6.629 6.46 6.294 6.13 5.968 5.81 5.654 5.501 5.351 5.203 5.059 4.918 4.781 4.646 4.514 4.386 4.26 4.138 4.018 3.902 3.789 3.678 3.571 3.466 3.364 3.265 3.168 3.075 2.983 2.895 2.808 2.725 2.643 2.564 2.487 2.413 2.34 2.27 2.201 2.135 2.071 2.008 1.947 1.888 1.831 1.776 1.722 1.67 1.619 1.57 1.522 1.476 1.431 1.387 1.345 1.304 1.264 1.226 1.188 1.152 1.117 1.083 1.05 1.018 0.987 0.957 0.927 0.899 0.872 0.845 0.819 0.794 0.77 0.746 0.723 0.701 0.68 0.659 0.639 0.619 0.6 0.582 0.564 0.547 0.53 0.514 0.498 0.483 0.468 0.454 0.44 0.426 0.413 0.401 0.388 0.377 0.365 0.354 0.343 0.333 0.322 0.312 0.303 0.294 0.285 0.276

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.641" PeakHeight="110.0" Num="3" Error="0.0">
-29.862 12.221 -2.748
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.641" EndFrequency="10.45" PeakHeight="335.724" Num="5" zHalfNm="265.437" Error="2.163">
-157.723 -67.962 18.807 -5.715 1.541
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="14.672" Depth="0.123"/>
<TopsideChapman PeakHeight="335.724" PeakDensity="1354869.8" PeakScaleHeight="50.213" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
