<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</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) 23:30:00</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">
FF202609003312330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.314" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="18.279" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.200" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="410.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="410.000" 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="0.650" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="617.311" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="489.244" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="417.267" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.763" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="107.089" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="18.186" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="54.012" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="115.720" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.460" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="106">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
445.000 440.000 435.000 430.000 425.000 430.000 427.500 425.000 435.000 432.000 429.000 426.000 423.000 420.000 425.000 410.000 410.000 410.000 410.000 415.000 420.000 415.000 410.000 410.000 410.000 430.000 415.000 423.333 431.667 440.000 445.000 457.500 470.000 470.000 470.000 445.000 453.333 461.667 470.000 470.000 470.000 470.000 470.000 465.000 460.000 460.000 460.000 460.000 460.000 460.000 460.000 460.000 460.000 461.000 462.000 463.000 464.000 465.000 465.000 470.000 475.000 475.000 480.000 480.000 490.000 490.000 490.000 495.000 500.000 500.000 500.000 505.000 509.500 514.000 518.500 523.000 527.500 532.000 536.500 541.000 545.500 550.000 557.500 565.000 565.000 565.000 570.000 571.250 572.500 573.750 575.000 576.610 578.388 580.360 582.562 585.034 587.830 591.019 594.690 598.960 603.989 610.000 617.311 626.395 637.986 653.288
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 0 0 51 57 0 57 54 0 0 0 0 57 51 54 57 57 54 0 54 0 57 48 51 54 51 0 0 54 0 48 0 51 48 63 0 0 0 0 0 54 48 0 51 0 0 0 0 0 0 63 60 0 0 57 0 51 48 0 0 60 60 57 57 54 54 0 60 54 54 54 60 51 54 57 54 60 48 57 54 54 54 0 57 57 57 0 0 0 54 54 51 0 0 51 0 0 0 48 48 48 45 0 51 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -1.171875 2.734375 -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 -1.171875 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 1.953125 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 1.171875 -0.390625 -1.953125 -1.171875 2.734375 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.163 150.0 155.0 160.0 165.0 170.0 175.0 180.0 180.325 185.0 190.0 195.0 200.0 205.0 210.0 215.0 215.488 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 489.244 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 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 0.408 0.467 0.527 0.589 0.653 0.72 0.79 0.863 0.94 1.02 1.103 1.191 1.282 1.377 1.477 1.581 1.689 1.801 1.918 2.039 2.166 2.296 2.432 2.573 2.718 2.869 3.024 3.185 3.35 3.521 3.697 3.877 4.063 4.254 4.449 4.649 4.853 5.062 5.273 5.488 5.705 5.923 6.142 6.359 6.573 6.783 6.984 7.176 7.353 7.512 7.648 7.759 7.84 7.887 7.9 7.9 7.891 7.871 7.838 7.795 7.742 7.68 7.61 7.531 7.446 7.354 7.257 7.155 7.048 6.938 6.824 6.708 6.589 6.468 6.345 6.222 6.098 5.973 5.848 5.723 5.599 5.475 5.352 5.23 5.109 4.989 4.871 4.754 4.639 4.525 4.413 4.303 4.195 4.089 3.984 3.882 3.782 3.683 3.587 3.493 3.401 3.311 3.223 3.136 3.052 2.97 2.89 2.812 2.735 2.661 2.588 2.517 2.448 2.381 2.315 2.251 2.189 2.128 2.069 2.011 1.955 1.901 1.848 1.796 1.746 1.697 1.649 1.603 1.558 1.514 1.472 1.43 1.39 1.351 1.313 1.276 1.239 1.204 1.17 1.137 1.105 1.074 1.043 1.014 0.985 0.957 0.93 0.904 0.878 0.853 0.829 0.805 0.782 0.76 0.739 0.718 0.697 0.677

</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="7.9" PeakHeight="489.244" Num="5" zHalfNm="417.267" Error="5.664">
-249.815 -41.483 19.577 -2.751 0.716
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="105.488" Depth="0.154"/>
<TopsideChapman PeakHeight="489.244" PeakDensity="774317.6" PeakScaleHeight="54.012" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
