<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 00:10:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: Moderate F-spread, 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" >
2026.04.01 (091) 00:10:00</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">
FF202609104010010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.353" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="15.294" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="6.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="405.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="405.000" 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="0.450" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="611.338" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.600" 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="476.122" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="402.876" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.926" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="109.123" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="12.332" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="53.714" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="118.500" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.500" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="61">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
425.000 415.000 405.000 430.000 425.000 420.000 424.000 428.000 432.000 436.000 440.000 445.000 450.000 457.500 465.000 467.500 470.000 480.000 485.000 485.000 480.000 485.000 485.000 490.000 490.000 492.500 495.000 497.500 500.000 507.500 515.000 475.000 480.000 490.000 500.000 510.000 518.000 526.000 534.000 542.000 550.000 555.000 562.500 570.000 575.000 585.000 586.500 588.000 589.500 591.000 592.500 594.000 595.500 597.000 598.500 599.578 601.021 603.055 606.133 611.338 622.039
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 48 54 0 51 0 48 0 0 51 0 48 0 54 0 60 57 54 0 51 57 60 60 54 60 0 0 0 0 60 51 48 0 54 57 0 0 51 0 51 51 48 54 57 54 0 0 0 0 0 0 0 0 0 51 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 -2.734375 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 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 -1.171875 -0.390625 -0.390625 -0.390625 1.953125 -0.390625 -1.171875 2.734375 1.171875 -0.390625 1.171875 -1.953125 0.390625 -0.390625 1.953125 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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.141 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.283 185.0 190.0 195.0 200.0 205.0 210.0 215.0 218.424 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 476.122 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 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 0.333 0.315 0.291 0.258 0.213 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.212 0.233 0.254 0.275 0.297 0.318 0.339 0.354 0.376 0.436 0.492 0.548 0.606 0.668 0.734 0.805 0.882 0.964 1.053 1.148 1.249 1.355 1.467 1.583 1.703 1.827 1.954 2.083 2.214 2.347 2.482 2.618 2.755 2.894 3.034 3.176 3.318 3.462 3.607 3.754 3.902 4.051 4.202 4.354 4.507 4.662 4.818 4.975 5.134 5.292 5.45 5.608 5.763 5.914 6.058 6.192 6.31 6.405 6.47 6.499 6.5 6.497 6.483 6.46 6.427 6.386 6.338 6.281 6.219 6.15 6.076 5.997 5.913 5.826 5.736 5.643 5.547 5.449 5.349 5.248 5.146 5.044 4.941 4.837 4.734 4.631 4.529 4.427 4.325 4.225 4.126 4.027 3.93 3.835 3.74 3.648 3.556 3.467 3.378 3.292 3.207 3.124 3.042 2.962 2.884 2.808 2.733 2.66 2.588 2.519 2.45 2.384 2.319 2.256 2.194 2.134 2.075 2.017 1.962 1.907 1.854 1.803 1.753 1.704 1.656 1.61 1.564 1.521 1.478 1.436 1.396 1.356 1.318 1.281 1.245 1.209 1.175 1.142 1.11 1.078 1.047 1.018 0.989 0.961 0.933 0.907 0.881 0.856 0.831 0.808 0.785 0.762 0.741 0.719 0.699 0.679 0.66 0.641 0.622 0.605 0.587 0.571 0.554 0.538 0.523 0.508

</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="6.5" PeakHeight="476.122" Num="5" zHalfNm="402.876" Error="6.265">
-237.103 -40.377 27.389 -11.961 4.354
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="108.424" Depth="0.154"/>
<TopsideChapman PeakHeight="476.122" PeakDensity="524193.56" PeakScaleHeight="53.714" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
