<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 23:30:00.000"
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, F2x cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, F2 cusps do not match, 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) 23:30:00</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">
FF202609104012330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="4.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.463" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="10.838" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="480.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="480.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="4.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="546.051" 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="3.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="445.769" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="374.642" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.267" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="104.329" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="5.481" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="52.184" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="114.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.510" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="28">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
480.000 480.000 480.000 480.000 485.000 487.500 490.000 490.000 490.000 495.000 495.946 496.995 498.165 499.477 500.960 502.649 504.590 506.845 509.495 512.656 516.490 521.237 527.270 535.191 546.051 561.860 586.994 633.164
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 54 0 54 54 0 51 0 51 48 0 0 0 57 57 0 54 0 51 0 0 0 0 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 -0.390625 0.390625 -0.390625 -0.390625 1.171875 0.390625 -0.390625 -1.171875 -0.390625 -0.390625 1.953125 -1.171875 -1.171875 -1.171875 0.390625 1.953125 -1.171875 -1.171875 -0.390625 1.953125 1.953125 -1.953125 1.953125
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.171 150.0 155.0 160.0 165.0 170.0 175.0 180.0 180.341 185.0 190.0 195.0 200.0 205.0 210.0 215.0 215.512 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 445.769 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.331 0.313 0.287 0.251 0.202 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.22 0.242 0.264 0.286 0.308 0.33 0.352 0.354 0.39 0.433 0.479 0.528 0.582 0.64 0.704 0.772 0.845 0.923 1.005 1.09 1.179 1.27 1.364 1.459 1.556 1.654 1.753 1.853 1.954 2.056 2.159 2.262 2.366 2.471 2.577 2.684 2.791 2.9 3.009 3.119 3.23 3.341 3.453 3.565 3.677 3.788 3.896 4.002 4.102 4.194 4.274 4.339 4.382 4.4 4.4 4.397 4.387 4.37 4.346 4.317 4.281 4.241 4.196 4.147 4.094 4.038 3.979 3.917 3.853 3.787 3.719 3.651 3.581 3.51 3.438 3.367 3.295 3.223 3.151 3.079 3.008 2.938 2.868 2.798 2.73 2.662 2.596 2.53 2.465 2.402 2.339 2.278 2.218 2.159 2.101 2.045 1.989 1.935 1.882 1.831 1.78 1.731 1.683 1.636 1.59 1.546 1.502 1.46 1.418 1.378 1.339 1.301 1.264 1.227 1.192 1.158 1.125 1.092 1.061 1.03 1.0 0.971 0.943 0.916 0.889 0.863 0.838 0.814 0.79 0.767 0.745 0.723 0.702 0.681 0.661 0.642 0.623 0.605 0.587 0.57 0.553 0.537 0.521 0.506 0.491 0.477 0.463 0.449 0.436 0.423 0.411 0.399 0.387 0.376 0.364 0.354 0.343 0.333 0.323 0.314 0.305 0.296 0.287 0.279 0.27 0.262

</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="4.4" PeakHeight="445.769" Num="5" zHalfNm="374.642" Error="3.574">
-209.746 -34.796 21.551 -9.483 2.217
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="105.512" Depth="0.154"/>
<TopsideChapman PeakHeight="445.769" PeakDensity="240198.52" PeakScaleHeight="52.184" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
