<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-18 -077 20:00:00.000"
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 0 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp</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" >
2026.03.18 (077) 20:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607703182000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="12.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.865" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="35.096" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.650" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.000" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.210" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="99.029" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="95.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="95.750" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="5.665" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.950" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="375.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.246" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="328.363" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="257.580" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.697" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.250" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="99.928" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="43.828" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="54.142" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="111.710" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.650" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="172">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 260.000 260.000 260.000 260.000 260.000 260.000 261.000 262.000 263.000 264.000 265.000 265.000 265.000 265.000 270.000 270.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.833 276.667 277.500 278.333 279.167 280.000 280.000 280.000 280.000 281.667 283.333 285.000 285.000 285.000 285.833 286.667 287.500 288.333 289.167 290.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 301.000 302.000 303.000 304.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 310.000 310.714 311.429 312.143 312.857 313.571 314.286 315.000 315.714 316.429 317.143 317.857 318.571 319.286 320.000 321.667 323.333 325.000 325.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 331.667 333.333 335.000 335.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 355.000 355.000 360.000 365.000 365.000 365.000 365.000 366.250 367.500 368.750 370.000 370.000 370.000 370.000 370.000 373.333 376.667 380.000 375.000 380.000 385.000 390.000 392.500 395.000 397.500 400.000 405.000 407.500 410.000 410.000 415.000 420.000 425.000 429.167 433.333 437.500 441.667 445.833 450.000 456.573 464.897 475.777 490.606 512.009 545.606
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 54 54 54 0 57 51 0 0 54 0 66 63 63 54 54 0 0 0 0 48 0 0 63 0 0 60 0 60 0 60 0 48 66 0 0 66 60 54 51 0 0 66 54 60 0 51 0 0 0 60 66 66 69 69 72 69 63 0 0 0 0 60 66 0 72 75 72 57 0 66 72 0 0 0 0 45 0 63 0 0 0 0 0 0 66 0 0 66 0 63 75 69 66 60 60 66 60 0 60 60 63 0 0 75 75 69 69 72 72 66 66 63 63 69 0 0 63 66 66 0 66 66 63 45 69 75 0 63 69 54 57 0 63 0 0 0 57 60 63 60 0 57 0 57 54 0 0 60 48 54 54 60 54 0 45 57 0 54 45 0 0 0 57 0 60 57 54 54 57 51 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 -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 -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 -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 -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 -1.953125 0.390625 0.390625 0.390625 0.390625 0.390625 2.734375 2.734375 -1.953125 0.390625 1.953125 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.0 2.05 2.1 2.15 2.2
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
99.029 100.189 101.489 102.968 104.687
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 51 0 63
</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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="29">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.25 2.3 2.35 2.4 2.45 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
103.750 102.500 101.250 100.000 105.000 110.000 110.000 110.000 110.000 105.000 105.000 110.000 108.000 106.000 104.000 102.000 100.000 110.000 95.000 97.500 100.000 102.500 105.000 100.000 100.000 105.000 110.000 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 66 54 57 0 0 0 66 0 63 0 0 63 0 60 60 60 0 63 0 0 66 60 0 57 57 57
</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 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 1.171875 1.171875 1.171875
</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" >
90.0 95.0 95.75 100.0 102.634 105.0 109.519 110.0 115.0 116.403 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 328.363 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.19 2.21 2.163 2.084 2.084 2.084 2.093 2.184 2.21 2.339 2.498 2.647 2.792 2.936 3.081 3.228 3.379 3.534 3.695 3.862 4.036 4.218 4.409 4.61 4.822 5.046 5.283 5.534 5.8 6.081 6.378 6.691 7.019 7.363 7.72 8.089 8.466 8.847 9.229 9.608 9.978 10.335 10.674 10.99 11.279 11.537 11.759 11.943 12.086 12.185 12.24 12.25 12.249 12.232 12.197 12.144 12.075 11.991 11.892 11.781 11.658 11.525 11.382 11.23 11.071 10.905 10.733 10.557 10.376 10.191 10.004 9.815 9.624 9.431 9.238 9.045 8.852 8.66 8.468 8.278 8.089 7.902 7.717 7.534 7.354 7.176 7.0 6.827 6.657 6.49 6.326 6.165 6.007 5.852 5.7 5.552 5.406 5.264 5.125 4.988 4.855 4.725 4.599 4.475 4.354 4.236 4.12 4.008 3.898 3.792 3.688 3.586 3.487 3.391 3.297 3.206 3.117 3.03 2.946 2.864 2.784 2.706 2.631 2.557 2.486 2.416 2.348 2.282 2.218 2.156 2.095 2.036 1.979 1.923 1.869 1.816 1.765 1.715 1.667 1.619 1.574 1.529 1.486 1.444 1.403 1.363 1.325 1.287 1.251 1.215 1.181 1.147 1.115 1.083 1.052 1.023 0.994 0.965 0.938 0.911 0.885 0.86 0.836 0.812 0.789 0.767 0.745 0.724 0.703 0.683 0.664 0.645 0.627 0.609 0.591 0.575 0.558 0.542 0.527 0.512 0.497 0.483 0.47 0.456 0.443 0.431 0.418

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.21" PeakHeight="95.75" Num="3" Error="1.513">
-8.319 3.264 -0.695
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.21" EndFrequency="12.25" PeakHeight="328.363" Num="5" zHalfNm="257.58" Error="3.136">
-180.164 -33.883 -2.203 3.143 1.147
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="20.653" Depth="0.126"/>
<TopsideChapman PeakHeight="328.363" PeakDensity="1861817.6" PeakScaleHeight="54.142" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
