<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 00:50:00.000"
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" >
2026.03.31 (090) 00:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202609003310050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.526" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="18.694" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="430.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="430.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="495.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="453.211" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="395.925" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.125" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="86.070" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="12.924" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="43.217" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="97.830" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.340" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="83">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
485.000 485.000 480.000 475.000 467.500 460.000 445.000 440.000 450.000 449.412 448.824 448.235 447.647 447.059 446.471 445.882 445.294 444.706 444.118 443.529 442.941 442.353 441.765 441.176 440.588 440.000 440.000 438.333 436.667 435.000 433.333 431.667 430.000 430.000 430.000 430.000 432.500 435.000 437.500 440.000 442.500 445.000 447.500 450.000 452.500 455.000 457.500 460.000 462.500 465.000 467.500 470.000 472.500 475.000 477.500 480.000 482.500 485.000 487.500 490.000 492.500 495.000 497.500 500.000 502.500 505.000 505.000 505.000 505.000 505.000 505.000 507.143 495.000 505.000 515.000 520.000 525.000 530.000 540.000 549.504 560.213 572.372 586.296
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 57 54 0 0 51 51 51 0 0 0 0 0 0 0 0 54 0 0 0 54 0 57 57 48 51 0 0 54 0 0 48 48 0 48 0 51 0 51 48 0 0 0 0 48 0 0 0 0 0 0 0 0 0 0 48 0 51 48 0 0 0 0 0 48 51 51 54 57 48 51 54 51 51 0 51 48 51 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 1.171875 0.390625 0.390625 -0.390625 0.390625 0.390625 -2.734375 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 1.171875 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 1.171875 -1.171875 -0.390625 -1.171875 0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -2.734375 0.390625 2.734375 0.390625 -0.390625 1.171875 -1.171875 0.390625 1.171875 1.171875 0.390625 -0.390625 0.390625 -1.171875 1.171875 1.953125 0.390625 1.171875 1.171875 0.390625 -0.390625 0.390625 -0.390625 1.171875 -0.390625 -0.390625 1.171875 0.390625 -0.390625 -0.390625 0.390625 1.953125 -0.390625 -0.390625 -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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.816 150.0 155.0 160.0 165.0 170.0 175.0 180.0 183.632 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 220.448 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 453.211 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 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 0.345 0.333 0.316 0.293 0.262 0.219 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.206 0.227 0.248 0.268 0.289 0.31 0.331 0.352 0.354 0.392 0.446 0.513 0.593 0.683 0.78 0.88 0.984 1.089 1.196 1.305 1.416 1.53 1.646 1.765 1.888 2.014 2.143 2.277 2.415 2.558 2.705 2.858 3.016 3.179 3.349 3.526 3.708 3.898 4.095 4.299 4.511 4.73 4.956 5.189 5.428 5.671 5.917 6.164 6.406 6.639 6.856 7.049 7.208 7.324 7.388 7.4 7.399 7.383 7.349 7.3 7.236 7.159 7.07 6.971 6.863 6.746 6.623 6.494 6.36 6.223 6.082 5.939 5.794 5.649 5.502 5.356 5.211 5.066 4.923 4.781 4.641 4.503 4.367 4.234 4.104 3.976 3.851 3.728 3.609 3.493 3.379 3.269 3.161 3.056 2.955 2.856 2.76 2.667 2.577 2.49 2.405 2.323 2.243 2.166 2.092 2.02 1.95 1.882 1.817 1.754 1.693 1.634 1.577 1.522 1.468 1.417 1.367 1.319 1.273 1.228 1.185 1.143 1.103 1.064 1.027 0.991 0.956 0.922 0.889 0.858 0.828 0.798 0.77 0.743 0.717 0.691 0.667 0.643 0.62 0.598 0.577 0.557 0.537 0.518 0.5 0.482 0.465 0.448 0.432 0.417 0.402 0.388 0.374 0.361 0.348 0.336 0.324 0.312 0.301 0.291 0.28 0.27 0.261 0.252 0.243 0.234

</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="7.4" PeakHeight="453.211" Num="5" zHalfNm="395.925" Error="5.746">
-207.408 -43.025 23.137 -3.548 -1.919
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="110.448" Depth="0.154"/>
<TopsideChapman PeakHeight="453.211" PeakDensity="679404.44" PeakScaleHeight="43.217" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
