Medium Scale Structure of the F-Region
Data collected during 1980/81 at Brighton, Colorado, show clearly that the F-region variations are undersampled in space and time by standard recording procedures. Fast temporal changes, with periods as short as 10 minutes, are directly observable if ionograms are taken in rapid sequences of a least...
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| creator | Paul, Adolf K |
| description | Data collected during 1980/81 at Brighton, Colorado, show clearly that the F-region variations are undersampled in space and time by standard recording procedures. Fast temporal changes, with periods as short as 10 minutes, are directly observable if ionograms are taken in rapid sequences of a least 12 ionograms per hour. In order to obtain a correct spatial sampling, the distances between observing stations should not be much larger than 100 kilometers. This conclusion is derived from the temporal variations of F-layer parameters assuming a propagation velocity typical for acoustic gravity waves. Some direct estimates of a spatial structure scale can be obtained from angle of arrival measurements. Comparisons of foF2 and MUF(3000) indicate that the main effect of gravity waves on the F-region structure is the variation of the height of the layer and to a lesser degree a variation of the maximum electron density. Keywords: F region variability; Sporadic E layer tilts.
Presented at the AGARD Conference, 16-20 May 1988, Munich, Germany, F.R. |
| format | Report |
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Presented at the AGARD Conference, 16-20 May 1988, Munich, Germany, F.R.</description><language>eng</language><subject>ACOUSTIC WAVES ; ANGLE OF ARRIVAL ; Atmospheric Physics ; ELECTRON DENSITY ; ESTIMATES ; F REGION ; GRAVITY WAVES ; IONOGRAMS ; IONOSPHERIC DISTURBANCES ; LIGHT TRANSMISSION ; MEASUREMENT ; PARAMETERS ; PE61152N ; RECORDING SYSTEMS ; SAMPLING ; SCALE ; SPATIAL DISTRIBUTION ; SPORATIC E LAYER ; TIME INTERVALS ; WUDN306212</subject><creationdate>1989</creationdate><rights>Approved for public release; distribution is unlimited.</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,778,883,27550,27551</link.rule.ids><linktorsrc>$$Uhttps://apps.dtic.mil/sti/citations/ADA208187$$EView_record_in_DTIC$$FView_record_in_$$GDTIC$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Paul, Adolf K</creatorcontrib><creatorcontrib>NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA</creatorcontrib><title>Medium Scale Structure of the F-Region</title><description>Data collected during 1980/81 at Brighton, Colorado, show clearly that the F-region variations are undersampled in space and time by standard recording procedures. Fast temporal changes, with periods as short as 10 minutes, are directly observable if ionograms are taken in rapid sequences of a least 12 ionograms per hour. In order to obtain a correct spatial sampling, the distances between observing stations should not be much larger than 100 kilometers. This conclusion is derived from the temporal variations of F-layer parameters assuming a propagation velocity typical for acoustic gravity waves. Some direct estimates of a spatial structure scale can be obtained from angle of arrival measurements. Comparisons of foF2 and MUF(3000) indicate that the main effect of gravity waves on the F-region structure is the variation of the height of the layer and to a lesser degree a variation of the maximum electron density. Keywords: F region variability; Sporadic E layer tilts.
Presented at the AGARD Conference, 16-20 May 1988, Munich, Germany, F.R.</description><subject>ACOUSTIC WAVES</subject><subject>ANGLE OF ARRIVAL</subject><subject>Atmospheric Physics</subject><subject>ELECTRON DENSITY</subject><subject>ESTIMATES</subject><subject>F REGION</subject><subject>GRAVITY WAVES</subject><subject>IONOGRAMS</subject><subject>IONOSPHERIC DISTURBANCES</subject><subject>LIGHT TRANSMISSION</subject><subject>MEASUREMENT</subject><subject>PARAMETERS</subject><subject>PE61152N</subject><subject>RECORDING SYSTEMS</subject><subject>SAMPLING</subject><subject>SCALE</subject><subject>SPATIAL DISTRIBUTION</subject><subject>SPORATIC E LAYER</subject><subject>TIME INTERVALS</subject><subject>WUDN306212</subject><fulltext>true</fulltext><rsrctype>report</rsrctype><creationdate>1989</creationdate><recordtype>report</recordtype><sourceid>1RU</sourceid><recordid>eNrjZFDzTU3JLM1VCE5OzElVCC4pKk0uKS1KVchPUyjJSFVw0w1KTc_Mz-NhYE1LzClO5YXS3Awybq4hzh66KSWZyfHFJZl5qSXxji6ORgYWhhbmxgSkAZvQI-Q</recordid><startdate>198903</startdate><enddate>198903</enddate><creator>Paul, Adolf K</creator><scope>1RU</scope><scope>BHM</scope></search><sort><creationdate>198903</creationdate><title>Medium Scale Structure of the F-Region</title><author>Paul, Adolf K</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-dtic_stinet_ADA2081873</frbrgroupid><rsrctype>reports</rsrctype><prefilter>reports</prefilter><language>eng</language><creationdate>1989</creationdate><topic>ACOUSTIC WAVES</topic><topic>ANGLE OF ARRIVAL</topic><topic>Atmospheric Physics</topic><topic>ELECTRON DENSITY</topic><topic>ESTIMATES</topic><topic>F REGION</topic><topic>GRAVITY WAVES</topic><topic>IONOGRAMS</topic><topic>IONOSPHERIC DISTURBANCES</topic><topic>LIGHT TRANSMISSION</topic><topic>MEASUREMENT</topic><topic>PARAMETERS</topic><topic>PE61152N</topic><topic>RECORDING SYSTEMS</topic><topic>SAMPLING</topic><topic>SCALE</topic><topic>SPATIAL DISTRIBUTION</topic><topic>SPORATIC E LAYER</topic><topic>TIME INTERVALS</topic><topic>WUDN306212</topic><toplevel>online_resources</toplevel><creatorcontrib>Paul, Adolf K</creatorcontrib><creatorcontrib>NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA</creatorcontrib><collection>DTIC Technical Reports</collection><collection>DTIC STINET</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Paul, Adolf K</au><aucorp>NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA</aucorp><format>book</format><genre>unknown</genre><ristype>RPRT</ristype><btitle>Medium Scale Structure of the F-Region</btitle><date>1989-03</date><risdate>1989</risdate><abstract>Data collected during 1980/81 at Brighton, Colorado, show clearly that the F-region variations are undersampled in space and time by standard recording procedures. Fast temporal changes, with periods as short as 10 minutes, are directly observable if ionograms are taken in rapid sequences of a least 12 ionograms per hour. In order to obtain a correct spatial sampling, the distances between observing stations should not be much larger than 100 kilometers. This conclusion is derived from the temporal variations of F-layer parameters assuming a propagation velocity typical for acoustic gravity waves. Some direct estimates of a spatial structure scale can be obtained from angle of arrival measurements. Comparisons of foF2 and MUF(3000) indicate that the main effect of gravity waves on the F-region structure is the variation of the height of the layer and to a lesser degree a variation of the maximum electron density. Keywords: F region variability; Sporadic E layer tilts.
Presented at the AGARD Conference, 16-20 May 1988, Munich, Germany, F.R.</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | DTIC Technical Reports |
| subjects | ACOUSTIC WAVES ANGLE OF ARRIVAL Atmospheric Physics ELECTRON DENSITY ESTIMATES F REGION GRAVITY WAVES IONOGRAMS IONOSPHERIC DISTURBANCES LIGHT TRANSMISSION MEASUREMENT PARAMETERS PE61152N RECORDING SYSTEMS SAMPLING SCALE SPATIAL DISTRIBUTION SPORATIC E LAYER TIME INTERVALS WUDN306212 |
| title | Medium Scale Structure of the F-Region |
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