《PROPAGATION OF RADIO WAVES AT FREQUENCIES BELOW 300 KCS》

A．The lower ionosphere1

1．PRESENT KNOWLEDGE OF THE LOWEST IONOSPHERE＆J．S．Belrose3

2．ELECTRON DENSITY DISTRIBUTION IN THE QUIET D-REGION DERIVED FROM OBSERVATIONS DURING OF CROSS-MODULATION＆R．Barrington and E．Thrane25

3．ON SOME NEW PROPERTIES OF THE LOWER IONOSPHERE＆M．Gutolo35

4．ANALYSIS OF CROSS-MODULATION BY V．A．BAILEY＇S EQUATION＆A．Pozzi43

B．D-layer irregularities49

5．D-LAYER IRREGULARITIES AND THEIR EFFECTS ON PROPAGA-TION＆J．Delloue and M．Garnier51

6．THE NATURE AND SCALE SIZE OF IRREGULARITIES IN THE D-REGION OF THE IONOSPHERE＆M．R．Paulson,E．E．Gossard and W．F．Moler61

C．The lower ionosphere and low frequency propagation73

7．THE＂LOFTI＂EXPERIMENT＆L．H．Rorden,R．L．Smith and R．A．Helliwell75

8．STUDIES OF THE ECHO POLARIZATION FROM HIGH GRADIENT PROFILES＆A．J．Ferraro and C．P．Tou83

9．ON THE PROPAGATION OF LONG WAVELENGTH TERRESTRIAL RADIO WAVES—TWO THEORETICAL TECHNIQUES＆J．R．Johler and L．A．Berry101

D．Oblique incidence measurements131

10．OBLIQUE INCIDENCE PULSE MEASUREMENTS AT 100 KC/s＆R．H．Doherty133

11．THE OBLIQUE REFLECTION OF Low FREQUENCY RADIO WAVES FROM THE IONOSPHERE＆J．S．Belrose149

E．Radio noise below 300 kc/s167

12．THE STATISTICAL FREQUENCY SPECTRUM OF ATMOSPHERICS＆H．Volland169

13．BAND EMISSIONS AT GYRO FREQUENCIES OF IONOSPHERIC IONS AND＂HISS＂FREQUENCIES＆G．Gustafson,A．Egeland,W．Barron and J．Aarons175

14．CHARACTERISTICS OF V．L．F．ATMOSPHERIC NOISE IN THE ARCTIC＆A．L．Whitson191

15．CONTINUOUS RECORDS OF RADIO NOISE IN THE V．L．F．BAND AND THEIR ATTACHMENT TO SOURCES＆G．Mattern209

F．Very low frequency propagation217

16．DIURNAL CHANGES IN THE TIME OF PROPAGATION OF V．L．F．WAVES OVER SINGLE MODE PATHS＆W．T．Blackband219

17．THE STATISTICAL PREDICTION OF DIURNAL PHASE CHANGES＆D．Hampton and A．S．Hill231

18．THE MODE THEORY OF V．L．F．RADIO PROPAGATION FOR A SPHERICAL EARTH AND A CONCENTRIC ANISOTROPIC IONO-SPHERE＆J．R．Wait239

19．PHASE VARIATIONS IN V．L．F．PROPAGATION＆C．J．Chilton,D．D．Crombie and A．Glenn Jean257

20．PROPAGATION OF V．L F．RADIO WAVES IN THE IONOSPHERE＆D．W．Swift291

21．PHASE RECORDINGS AT BOSTON OF FIVE V．L．F．STATIONS DURING THE 9TH JULY,1962,JOHNSON ISLAND DETONATION＆R．Woodward and G．J．Gassmann321

22．RECENT V．L．F．WORK AT THE US ARMY ELECTRONICS RE-SEARCH AND DEVELOPMENT LABORATORY＆F．H．Reder and G．M．R．Winkler335

G．Extremely low frequency propagation339

23．INFLUENCE DE LA REPARTITION DU COURANT DANS L＇ECLAIR SUR SON RAYONNEMENT A GRANDE DISTANCE＆J．Papet-Lepine341

24．EXTREMELY LOW FREQUENCY MAGNETIC WAVES IN AN INHOMO-GENEOUS HYDROMAGNETIC MEDIUM＆W．G．Hoffman351

25．INFLUENCE OF THE IONOSPHERE ON THE POLARIZATION OF V．L．F．AND E．L．F．RADIO WAVES＆F．W．Chapman and D．G．C．Jones361

26．MAGNETIC RECORDS BETWEEN 0·2 AND 30 c/s＆R．Gendrin and R．Stefant371

H．Earth resonance401

27．THUNDERSTORM EXCITATION OF THE EARTH-IONOSPHERE CAVITY＆M．Balser and C．A．Wagner403

28．EARTH-IONOSPHERE CAVITY RESONANCES AND EFFECTIVE IONOSPHERE PARAMETERS＆F．W．Chapman and D．L．Jones413

29．THE NATURAL E．L．F．ELECTROMAGNETIC NOISE IN THE BAND 2-40 c/s＆M．J．Rycroft and T．M．Wormell421

30．SOME RECENT MAGNETIC FIELD MEASUREMENTS IN THE EARTH-IONOSPHERE RESONANCE REGION＆C．Polk435

31．NOTES ON SETS OF CONJUGATE PAIRS＆N．C．Gerson457

32．CONCLUDING REMARKS＆W．Dieminger and E．Vassy465

NAME INDEX OF PERSONS AND INSTITUTIONS469

SUBJECT INDEX474

PLACE INDEX477