<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-30 -089 00:30:00.000"
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 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" >
2026.03.30 (089) 00:30:00</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">
FF202608903300030009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.585" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="20.423" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.200" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="340.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="340.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="470.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="430.646" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="380.089" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.284" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="75.781" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="13.018" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="38.308" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="84.710" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.300" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="109">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.5 2.55 2.6 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" >
340.000 341.667 343.333 345.000 350.000 355.000 360.000 370.000 371.667 373.333 375.000 380.000 382.500 385.000 385.000 390.000 391.818 393.636 395.455 397.273 399.091 400.909 402.727 404.545 406.364 408.182 410.000 415.000 415.000 415.000 417.500 420.000 420.000 420.000 417.500 415.000 420.000 425.000 460.000 440.000 445.000 444.091 443.182 442.273 441.364 440.455 439.545 438.636 437.727 436.818 435.909 435.000 435.000 430.000 425.000 423.333 421.667 420.000 418.333 416.667 415.000 410.000 407.500 405.000 406.667 408.333 410.000 410.000 410.000 410.000 420.000 425.000 426.667 428.333 430.000 430.000 435.000 437.000 439.000 441.000 443.000 445.000 450.000 450.000 455.000 455.000 455.000 460.000 455.000 457.500 460.000 460.000 460.000 470.000 475.000 472.500 470.000 485.000 500.000 505.000 520.000 520.000 520.657 521.524 522.722 524.485 527.336 532.728 546.799
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 60 57 0 66 66 63 0 60 63 0 63 0 60 0 0 60 63 0 54 0 0 0 51 54 51 48 54 0 48 0 57 0 60 57 54 48 54 54 0 0 0 0 54 0 0 0 0 0 51 54 0 0 0 0 60 0 0 63 63 0 54 0 0 54 0 0 54 60 60 0 0 60 57 57 0 57 0 0 54 60 57 54 54 57 57 57 0 54 0 54 54 54 0 51 0 57 0 57 0 51 54 54 54 57 0 48
</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 -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 -1.171875 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 1.171875 -0.390625 2.734375 1.953125 -0.390625 -1.171875 1.171875 -0.390625 0.390625 0.390625 -1.171875 -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 -2.734375 1.953125 -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 1.171875 -0.390625 -2.734375 -0.390625 -0.390625 0.390625 -2.734375 0.390625 -2.734375 -0.390625 1.171875 -0.390625 1.171875 0.390625 -0.390625 -1.171875 -1.171875 -0.390625 0.390625 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="175">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.503 150.0 155.0 160.0 165.0 170.0 175.0 180.0 183.005 185.0 190.0 195.0 200.0 205.0 210.0 215.0 219.508 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 430.646 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0
</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 0.292 0.26 0.216 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.208 0.23 0.251 0.272 0.293 0.314 0.335 0.354 0.359 0.418 0.491 0.575 0.668 0.766 0.868 0.973 1.082 1.194 1.31 1.429 1.553 1.682 1.815 1.954 2.098 2.249 2.407 2.571 2.744 2.924 3.113 3.312 3.52 3.738 3.968 4.208 4.46 4.724 4.999 5.285 5.581 5.884 6.191 6.499 6.799 7.085 7.345 7.568 7.741 7.854 7.899 7.9 7.89 7.856 7.8 7.724 7.63 7.521 7.398 7.263 7.117 6.964 6.804 6.638 6.468 6.295 6.121 5.945 5.769 5.593 5.419 5.246 5.076 4.908 4.743 4.581 4.422 4.268 4.117 3.969 3.826 3.687 3.552 3.42 3.293 3.17 3.051 2.936 2.824 2.717 2.613 2.513 2.416 2.322 2.232 2.146 2.062 1.982 1.904 1.83 1.758 1.689 1.623 1.559 1.497 1.438 1.381 1.327 1.274 1.224 1.175 1.129 1.084 1.041 1.0 0.96 0.922 0.885 0.85 0.816 0.783 0.752 0.722 0.693 0.666 0.639 0.614 0.589 0.566 0.543 0.522 0.501 0.481 0.462 0.443 0.425 0.408 0.392 0.377 0.361 0.347 0.333 0.32 0.307 0.295 0.283 0.272 0.261 0.25 0.24 0.231 0.222 0.213 0.204

</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="430.646" Num="5" zHalfNm="380.089" Error="5.469">
-186.985 -39.615 17.835 -0.715 -1.658
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="109.508" Depth="0.154"/>
<TopsideChapman PeakHeight="430.646" PeakDensity="774317.6" PeakScaleHeight="38.308" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
