<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-28 -087 18:50:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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" >
2026.03.28 (087) 18:50:00</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">
FF202608703281850009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="13.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.390" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.185" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="9.250" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="7.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="415.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="415.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" Name="h`Es" 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="12.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="550.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.786" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="8.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="8.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="426.174" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="341.540" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.584" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.000" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="119.204" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="65.541" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="68.737" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="176.840" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="7.000" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="122">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45 12.5 12.55 12.6 12.65 12.7 12.75 12.8 12.85 12.9 12.95 13.0 13.05
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
610.000 612.500 615.000 615.000 620.000 622.500 625.000 630.000 630.000 621.042 612.083 603.125 594.167 585.208 576.250 567.292 558.333 549.375 540.417 531.458 522.500 513.542 504.583 495.625 486.667 477.708 468.750 459.792 450.833 441.875 432.917 423.958 415.000 415.000 415.000 417.500 420.000 422.500 425.000 425.000 428.333 431.667 435.000 435.000 435.000 440.000 440.000 440.000 445.000 445.000 445.000 445.000 450.000 452.500 455.000 455.000 455.000 455.000 455.000 455.000 455.000 460.000 460.000 460.000 462.500 465.000 465.000 465.000 467.500 470.000 472.500 475.000 477.500 480.000 480.000 480.000 482.500 485.000 485.000 487.500 490.000 492.500 495.000 495.000 495.000 497.500 500.000 505.000 507.500 510.000 512.500 515.000 517.500 520.000 522.500 525.000 527.500 530.000 532.500 535.000 537.500 540.000 540.000 545.000 550.000 550.000 550.000 560.000 565.000 568.190 571.714 575.628 580.000 584.916 590.484 596.842 604.172 612.716 622.801 634.887 649.635 668.031
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 48 48 0 0 54 51 51 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 51 54 45 0 0 0 57 51 0 0 63 69 72 66 69 69 60 0 0 51 60 0 0 0 0 54 57 57 51 0 57 51 0 54 57 54 0 0 0 0 0 51 51 57 0 48 0 0 48 0 45 0 48 0 51 48 0 0 0 0 0 0 0 45 0 0 0 48 0 51 51 51 51 54 0 48 48 48 48 48 48 48 48 48 48 0 45 45 42 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.953125 -2.734375 -1.171875 0.390625 -1.171875 -2.734375 2.734375 -1.171875 2.734375 -1.953125 -2.734375 -1.953125 0.390625 -2.734375 -1.953125 1.953125 -1.171875 2.734375 0.390625 -1.953125 -2.734375 -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 -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 -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 2.734375 -0.390625 1.171875 0.390625 -1.171875 0.390625 0.390625 0.390625 0.390625 -0.390625 1.953125 -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 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="126">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 117.500 115.000 115.000 115.000 115.000 115.000 120.000 117.500 115.000 115.000 125.000 125.000 120.000 120.000 120.000 120.000 120.000 115.000 115.000 115.000 115.000 116.667 118.333 120.000 120.000 120.000 120.000 120.000 120.000 110.000 125.000 120.000 120.000 119.231 118.462 117.692 116.923 116.154 115.385 114.615 113.846 113.077 112.308 111.538 110.769 110.000 110.000 110.000 115.000 115.000 115.000 115.000 115.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 57 57 0 0 0 57 63 63 57 0 51 63 0 57 63 60 0 63 54 51 48 54 0 0 51 63 72 0 0 69 0 48 60 0 48 0 45 60 72 48 54 57 45 48 0 0 0 0 0 48 0 0 0 0 63 69 72 72 69 75 72 75 69 66 66 72 72 0 0 66 69 72 72 0 72 75 75 0 0 0 0 0 69 72 72 72 72 69 69 69 72 72 0 63 0 0 0 0 0 66 0 66 69 66 63 66 66 66 66 63 0 0 63 66 66 66 54 57 60 0 0 0 57 57 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.583 90.0 95.0 100.0 105.0 110.0 114.196 115.0 118.392 120.0 122.588 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 426.174 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 1.872 2.412 2.696 2.786 2.664 2.664 2.664 2.711 2.786 2.854 3.013 3.191 3.377 3.559 3.731 3.894 4.048 4.195 4.335 4.47 4.602 4.73 4.855 4.979 5.101 5.222 5.342 5.461 5.581 5.701 5.821 5.941 6.063 6.185 6.309 6.435 6.562 6.692 6.824 6.958 7.096 7.237 7.381 7.53 7.683 7.842 8.006 8.177 8.355 8.541 8.736 8.941 9.158 9.389 9.634 9.896 10.177 10.476 10.793 11.123 11.456 11.78 12.079 12.34 12.559 12.735 12.869 12.965 13.024 13.049 13.05 13.046 13.03 13.001 12.96 12.908 12.846 12.774 12.692 12.602 12.504 12.399 12.286 12.167 12.043 11.913 11.778 11.639 11.496 11.35 11.2 11.048 10.893 10.737 10.579 10.419 10.259 10.098 9.936 9.774 9.612 9.45 9.288 9.127 8.967 8.807 8.649 8.492 8.335 8.181 8.027 7.876 7.725 7.577 7.43 7.285 7.142 7.001 6.862 6.725 6.59 6.456 6.325 6.196 6.069 5.944 5.821 5.701 5.582 5.465 5.351 5.238 5.127 5.019 4.912 4.808 4.705 4.605 4.506 4.409 4.314 4.221 4.13 4.041 3.953 3.867 3.783 3.701 3.62 3.541 3.464 3.388 3.313 3.241 3.17 3.1 3.032 2.965 2.899 2.835 2.773 2.711 2.651 2.593 2.535 2.479 2.424 2.37 2.318 2.266 2.216 2.167 2.118 2.071 2.025 1.98 1.936 1.893 1.85 1.809 1.769 1.729 1.691 1.653 1.616 1.58

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.786" PeakHeight="110.0" Num="3" Error="0.0">
-30.005 12.426 -2.838
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.786" EndFrequency="13.05" PeakHeight="426.174" Num="5" zHalfNm="341.54" Error="18.495">
-243.135 -83.417 13.457 18.128 -8.619
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="12.588" Depth="0.122"/>
<TopsideChapman PeakHeight="426.174" PeakDensity="2112934.2" PeakScaleHeight="68.737" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
