<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-28 -087 18:10:00.000"
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="1 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) 18:10:00</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">
FF202608703281810009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="12.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.423" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.018" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="8.200" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="7.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.000" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.110" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="370.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="370.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="111.097" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="120.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.950" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="530.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.000" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="7.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="7.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.174" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="399.505" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="293.534" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.438" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.150" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="141.516" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="69.712" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="77.420" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="190.350" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.100" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="7.000" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="117">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
370.000 370.000 370.000 372.500 375.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 390.000 392.500 395.000 395.000 395.000 395.000 400.000 405.000 405.000 407.500 410.000 415.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 430.000 435.000 440.000 440.000 440.000 445.000 445.000 445.000 450.000 450.000 452.500 455.000 455.000 455.000 455.000 455.000 455.000 460.000 460.000 460.000 460.000 465.000 465.000 465.000 470.000 470.000 470.000 470.000 475.000 475.000 475.000 475.000 475.000 475.000 477.500 480.000 481.250 482.500 483.750 485.000 485.000 490.000 491.000 492.000 493.000 494.000 495.000 495.000 495.000 495.000 497.500 500.000 502.143 504.286 506.429 508.571 510.714 512.857 515.000 515.000 515.000 525.000 520.000 525.000 530.000 530.000 530.000 540.000 545.000 545.000 545.000 550.000 560.000 560.000 565.000 570.000 580.000 585.000 590.000 600.000 610.000 622.221 636.727 654.225
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 63 63 0 63 72 72 66 69 69 66 72 66 0 60 69 57 75 51 63 69 0 69 57 66 75 72 69 72 69 72 69 72 72 72 60 66 66 57 63 66 66 66 0 57 0 66 60 57 54 60 60 60 51 60 63 63 63 63 63 60 57 54 54 0 0 54 0 54 0 0 0 54 57 45 0 0 0 0 54 57 0 51 0 51 0 0 45 0 45 0 48 51 48 45 54 0 54 54 54 51 48 0 54 54 51 51 48 45 48 48 48 0 45 45 45 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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 -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 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 -1.171875 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 -0.390625 0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="3">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.0 3.05 3.1
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
111.097 112.774 115.068
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="102">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 115.000 115.000 120.000 125.000 125.000 125.000 130.000 130.000 125.000 125.000 125.000 125.000 125.000 125.000 120.000 120.000 130.000 130.000 115.000 115.000 115.000 130.000 115.000 115.625 116.250 116.875 117.500 118.125 118.750 119.375 120.000 115.000 125.000 123.750 122.500 121.250 120.000 120.000 115.000 110.000 110.000 110.000 110.556 111.111 111.667 112.222 112.778 113.333 113.889 114.444 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.833 116.667 117.500 118.333 119.167 120.000 120.000 117.500 115.000 115.000 115.000 117.500 120.000 115.000 115.000 115.000 120.000 120.000 115.000 115.000 115.000 120.000 120.000 120.000 115.000 115.000 115.000 115.000 120.000 120.000 115.000 115.000 116.000 117.000 118.000 119.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 51 48 48 51 48 51 51 57 0 0 0 54 57 51 57 45 0 54 66 69 51 66 0 0 0 0 0 0 0 63 69 48 0 0 0 63 54 0 72 54 54 0 0 0 0 0 0 0 0 72 57 72 75 72 0 78 78 0 0 0 0 0 51 54 0 72 69 66 54 60 57 0 66 57 63 54 0 63 54 57 57 57 48 54 54 57 51 51 45 0 0 0 0 48 48 48 48 0 48 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -1.171875 0.390625 -0.390625 -2.734375 1.171875 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 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 -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 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
</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" >
89.527 90.0 95.0 100.0 105.0 110.0 113.215 115.0 116.43 119.645 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 399.505 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.091 2.692 3.009 3.11 2.984 2.984 2.984 3.11 3.123 3.306 3.496 3.687 3.876 4.062 4.245 4.424 4.599 4.771 4.94 5.107 5.272 5.436 5.598 5.759 5.92 6.08 6.24 6.4 6.56 6.721 6.882 7.044 7.207 7.371 7.536 7.703 7.871 8.041 8.213 8.387 8.563 8.741 8.922 9.105 9.291 9.479 9.67 9.864 10.061 10.261 10.464 10.669 10.876 11.085 11.295 11.505 11.713 11.917 12.113 12.297 12.464 12.605 12.713 12.78 12.8 12.8 12.794 12.778 12.752 12.717 12.674 12.622 12.563 12.496 12.422 12.342 12.256 12.164 12.066 11.964 11.857 11.745 11.63 11.512 11.39 11.265 11.137 11.007 10.875 10.741 10.605 10.468 10.33 10.191 10.051 9.911 9.77 9.629 9.488 9.347 9.206 9.065 8.925 8.786 8.647 8.509 8.371 8.235 8.1 7.965 7.832 7.701 7.57 7.441 7.313 7.186 7.061 6.937 6.815 6.695 6.575 6.458 6.342 6.227 6.115 6.003 5.894 5.786 5.679 5.574 5.471 5.369 5.269 5.171 5.074 4.979 4.885 4.793 4.702 4.613 4.525 4.439 4.354 4.271 4.189 4.109 4.03 3.952 3.876 3.801 3.728 3.656 3.585 3.515 3.447 3.38 3.314 3.25 3.186 3.124 3.063 3.003 2.944 2.887 2.83 2.774 2.72 2.666 2.614 2.563 2.512 2.463 2.414 2.366 2.32 2.274 2.229 2.185 2.142 2.099 2.058 2.017 1.977 1.938 1.9 1.862

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.11" PeakHeight="110.0" Num="3" Error="0.0">
-30.286 12.835 -3.022
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.11" EndFrequency="12.8" PeakHeight="399.505" Num="5" zHalfNm="293.534" Error="2.817">
-235.08 -70.367 28.64 -1.843 -1.21
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.645" Depth="0.126"/>
<TopsideChapman PeakHeight="399.505" PeakDensity="2032754.4" PeakScaleHeight="77.42" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
