{"title":"COMPARISON OF OBSERVED ATMOSPHERIC RADIO REFRACTION EFFECTS WITH VALUES PREDICTED THROUGH THE USE OF SURFACE WEATHER OBSERVATIONS","authors":"B. Bean, G. D. Thayer","doi":"10.6028/JRES.067D.031","DOIUrl":"https://doi.org/10.6028/JRES.067D.031","url":null,"abstract":"","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132341345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Reception of W VVV at four h igh-latitude stations is compared with ionospheric data during a period of severe ionospher ic sto rm iness. It was found that the reception q uality of WWV closely follows the morphology of t he d isturbance. Reception at the lower freq uencies was affected primarily by t he peA event and a urora l.-zone absorpt,ion, whi le at t he h igh er frequencies rcception depended upon the storm-time behavioJ' of thc F region. Also, reception was strollgly affected for several hours during the storm by the a ppearance of a large sporadic-E cloud. D es pite the fact that rcce ption quality was assessed by alll'al monitoring, agreement betll'ec n the reported 'vV'vVV reception and t hat which would be expected from the iono3phcric data is rath er good. It is conclu ded that the behavior of radio reception can be explained on the basis of t he space-time variations in ionospheric parameters.
{"title":"WWV reception in the arctic during ionospheric disturbances","authors":"G. E. Hill, J. Herman","doi":"10.6028/JRES.067D.020","DOIUrl":"https://doi.org/10.6028/JRES.067D.020","url":null,"abstract":"Reception of W VVV at four h igh-latitude stations is compared with ionospheric data during a period of severe ionospher ic sto rm iness. It was found that the reception q uality of WWV closely follows the morphology of t he d isturbance. Reception at the lower freq uencies was affected primarily by t he peA event and a urora l.-zone absorpt,ion, whi le at t he h igh er frequencies rcception depended upon the storm-time behavioJ' of thc F region. Also, reception was strollgly affected for several hours during the storm by the a ppearance of a large sporadic-E cloud. D es pite the fact that rcce ption quality was assessed by alll'al monitoring, agreement betll'ec n the reported 'vV'vVV reception and t hat which would be expected from the iono3phcric data is rath er good. It is conclu ded that the behavior of radio reception can be explained on the basis of t he space-time variations in ionospheric parameters.","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131213733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Some wave functions and potential functions pertaining to spherically stratified media","authors":"C. Tai","doi":"10.6028/JRES.067D.023","DOIUrl":"https://doi.org/10.6028/JRES.067D.023","url":null,"abstract":"","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126472484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Relative convergence of the solution of a doubly infinite set of equations","authors":"R. Mittra","doi":"10.6028/JRES.067D.027","DOIUrl":"https://doi.org/10.6028/JRES.067D.027","url":null,"abstract":"","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115641357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The protection of frequencies for radio astronomy","authors":"R. L. Smith-Rose","doi":"10.6028/JRES.067D.014","DOIUrl":"https://doi.org/10.6028/JRES.067D.014","url":null,"abstract":"","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116084091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Empirical determination of total atmospheric refraction at centimeter wavelengths by radiometric means","authors":"Alan C. Anway","doi":"10.6028/JRES.067D.018","DOIUrl":"https://doi.org/10.6028/JRES.067D.018","url":null,"abstract":"","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"21 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123570561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The characteristics of twoand three-loop superdirect ive a nte nn a arrays arc presen led . At VLF, t his type of array appears to h ave m any d esirab le qua li t ies, an d the usua l dctr'i me ntal ch a racteristics associated wi th superdirectivity are less in evid e nce. It is shown that the beamwid th is n arrowest, the front-to-back voltage and power ratios m'e g reat est, a nd the posit ion of t he back lobes and nulls are most invari a nt whf'n closel.v spaeed loops are used . Inequaliti es in s ignals from the individua l loops tend to obscure t he front a nd back lobe' and limit t he proxim ity of th e loops.
{"title":"Two- and three-loop superdirective receiving antennas","authors":"E. Seeley","doi":"10.6028/JRES.067D.025","DOIUrl":"https://doi.org/10.6028/JRES.067D.025","url":null,"abstract":"The characteristics of twoand three-loop superdirect ive a nte nn a arrays arc presen led . At VLF, t his type of array appears to h ave m any d esirab le qua li t ies, an d the usua l dctr'i me ntal ch a racteristics associated wi th superdirectivity are less in evid e nce. It is shown that the beamwid th is n arrowest, the front-to-back voltage and power ratios m'e g reat est, a nd the posit ion of t he back lobes and nulls are most invari a nt whf'n closel.v spaeed loops are used . Inequaliti es in s ignals from the individua l loops tend to obscure t he front a nd back lobe' and limit t he proxim ity of th e loops.","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126569255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The characteristics of the lunar surface dedu ced from radar-lunar measurements conducted at the U.S. Air Force Trinidad T est Site during 1960 a re discussed . Evidence is presente~ which te nds to con firm t hat, at 425 megacycles per second, thc fron t portion of the moon IS a co mparatIvely smooth reflector while t he back portion behaves as a rough scatterer. The pulse decay of t he average envelope of lunar echoes is found to follow t he slope of the Lomrncl-Seeli ger scatteri ng la w. From the cumulative probab ili t.v dist ribu tions of thc total cross section of t he moon meas ured on t ,,·o different d ay~, it is indi cated t hat 50 percent of t he total cross section measurcments were less t han 5.0 to 8.5 X IOll square meters 01' 117.0 to 119.3 decibels abovc one square meter. Sta t istical data, such as the probability densi ty fun ctions of t he total lunar echo amp litude a nd t he autocorrelation func tion, a re also prese nted. . Th e power density spectr um co mpu tcd from t he au toco rrelation function is co mpart'cl With t he t heoretICal Doppler spread resul t ing from the moon's libration .
本文讨论了1960年在美国空军特立尼达试验场进行的雷达-月球测量所推断出的月球表面特征。有证据表明，在每秒425兆周的速度下，月球的前部是一个相对平滑的反射体，而后部则是一个粗糙的散射体。t的脉冲衰减他发现月球的平均包络回声跟随t他的斜率Lomrncl-Seeli蒙古包scatteri ng la w。从累积probab伊犁电视dist ribu设计截面总量的月球被保险人在t, t,·o d ay ~不同,并t帽50%的他总截面measurcments t汉族较低5.0 - 8.5 X IOll平方米01 ' 117.0到119.3分贝abovc一平方米。给出了月球总回波振幅的概率密度函数和自相关函数等统计数据。功率密度谱与由月球自转引起的理论多普勒频散是相等的。
{"title":"Radar reflections from the moon at 425 Mc/s","authors":"G. Millman, F. L. Rose","doi":"10.6028/JRES.067D.015","DOIUrl":"https://doi.org/10.6028/JRES.067D.015","url":null,"abstract":"The characteristics of the lunar surface dedu ced from radar-lunar measurements conducted at the U.S. Air Force Trinidad T est Site during 1960 a re discussed . Evidence is presente~ which te nds to con firm t hat, at 425 megacycles per second, thc fron t portion of the moon IS a co mparatIvely smooth reflector while t he back portion behaves as a rough scatterer. The pulse decay of t he average envelope of lunar echoes is found to follow t he slope of the Lomrncl-Seeli ger scatteri ng la w. From the cumulative probab ili t.v dist ribu tions of thc total cross section of t he moon meas ured on t ,,·o different d ay~, it is indi cated t hat 50 percent of t he total cross section measurcments were less t han 5.0 to 8.5 X IOll square meters 01' 117.0 to 119.3 decibels abovc one square meter. Sta t istical data, such as the probability densi ty fun ctions of t he total lunar echo amp litude a nd t he autocorrelation func tion, a re also prese nted. . Th e power density spectr um co mpu tcd from t he au toco rrelation function is co mpart'cl With t he t heoretICal Doppler spread resul t ing from the moon's libration .","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"241 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115781463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract : Expressions were developed for the complete radiation pattern from a finite axial slot on an infinite circular cylinder covered with a homogeneous, uniform plasma sheath. The resulting field expressions are functions of both the longitude angle and the polar angle. Numerical results were obtained for a thin lossless plasma to determine the variation of the field pattern with plasma frequency, plasma thickness, slot width, and cylinder radius. These results are presented graphically to illustrate various properties of the radiating system. (Author)
{"title":"RADIATION FROM A PLASMA-CLAD AXIALLY-SLOTTED CYLINDER","authors":"W. Rusch","doi":"10.6028/JRES.067D.024","DOIUrl":"https://doi.org/10.6028/JRES.067D.024","url":null,"abstract":"Abstract : Expressions were developed for the complete radiation pattern from a finite axial slot on an infinite circular cylinder covered with a homogeneous, uniform plasma sheath. The resulting field expressions are functions of both the longitude angle and the polar angle. Numerical results were obtained for a thin lossless plasma to determine the variation of the field pattern with plasma frequency, plasma thickness, slot width, and cylinder radius. These results are presented graphically to illustrate various properties of the radiating system. (Author)","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122534768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The integral equation for t he electric fi eld distribut ion in t h e slot which is excited by a current source at its center is solved for t h e longitudinal fi eld variation by Halh~n 's iteration method. The first order solut ion of t he slo t susceptance provides an agreement with computations based on the variat ional method for cavit ie as shallow as "A/20 prov id ed t h e s lot length exceeds "A/2. There is n o agreement for very sha llow cavi t ies, where the fi elds are rapidly attenuated a long t he slot according to t he variational solution . A si mple closed-form a pproximation to t he suscep tance is applicabJe if the slot and the' cavity are of equal lengths. The first-order slot conductance is accurate only for approximately "A/2 long slots which a re backed by deeper cavities ,
{"title":"Hallen's method in the problem of a cavity-backed rectangular slot antenna","authors":"J. Galejs","doi":"10.6028/JRES.067D.026","DOIUrl":"https://doi.org/10.6028/JRES.067D.026","url":null,"abstract":"The integral equation for t he electric fi eld distribut ion in t h e slot which is excited by a current source at its center is solved for t h e longitudinal fi eld variation by Halh~n 's iteration method. The first order solut ion of t he slo t susceptance provides an agreement with computations based on the variat ional method for cavit ie as shallow as \"A/20 prov id ed t h e s lot length exceeds \"A/2. There is n o agreement for very sha llow cavi t ies, where the fi elds are rapidly attenuated a long t he slot according to t he variational solution . A si mple closed-form a pproximation to t he suscep tance is applicabJe if the slot and the' cavity are of equal lengths. The first-order slot conductance is accurate only for approximately \"A/2 long slots which a re backed by deeper cavities ,","PeriodicalId":398550,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section D: Radio Propagation","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126882989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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