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RELATIVE EFFICIENCY OF SFA'S AT 164 KHZ AND ITS SEASONAL VARIATION.LETFUS V; NESTOROV GT.1977; BALG. GEOFIZ. SPIS.; BALG.; DA. 1977; VOL. 3; NO 2; PP. 93-101; ABS. BULG.; BIBL. 11 REF.Article

REPRESENTABILITY OF SID EFFECTS OBSERVED BY DIFFERENT METHODSLETFUS V; NESTOROV G.1973; BULL. ASTR. INST. CZECHOSL.; GZECHOSL.; DA. 1973; VOL. 24; NO 4; PP. 191-195; ABS. RUSSE; BIBL. 8 REF.Serial Issue

SPECTRAL ANALYSIS OF THE TIME VARIATIONS OF SOLAR X-RAYS IN THE 1-8 A AND 8-20 A REGIONS.APOSTOLOV EM; LETFUS V.1975; BULL. ASTR. INST. CZECHOSL.; CZECHOSL.; DA. 1975; VOL. 26; NO 4; PP. 193-198; ABS. RUSSE; BIBL. 11 REF.Article

Solar activity in the sixteenth and seventeeth centuries: a revisionLETFUS, V.Solar physics. 1993, Vol 145, Num 2, pp 377-388, issn 0038-0938Article

X-RAY EMISSION OF CORONAL CONDENSATIONS DURING THE ECLIPSE ON 20 MAY 1966 AND ITS CONNECTION WITH OPTICAL AND RADIO OBSERVATIONSLETFUS V; LIVSHITS MA.1972; BULL. ASTR. INST. CZECHOSL.; CZECHOSL.; DA. 1972; VOL. 23; NO 6; PP. 307-315; ABS. RUSSE; BIBL. 29REF.Serial Issue

Prediction of the height of solar cycle 23LETFUS, V.Solar physics. 1994, Vol 149, Num 2, pp 405-411, issn 0038-0938Article

COMPLEX TIME ANALYSIS OF RECURRENT ACTIVITY OF CORONAL INDEX 1971-1976LETFUS V; APOSTOLOV EM.1982; BULL. ASTRON. INST. CZECH.; ISSN 0004-6248; CSK; DA. 1982; VOL. 33; NO 5; PP. 294-302; ABS. RUS; BIBL. 12 REF.Article

LONGITUDINAL DISTRIBUTION OF RECURRENT SOLAR ACTIVITY SOURCES AND ITS REFLECTION IN GEOMAGNETIC VARIATIONSLETFUS V; APOSTOLOV EM.1980; BULL. ASTR. INST. CZECHOSL.; CSK; DA. 1980; VOL. 31; NO 2; PP. 119-122; ABS. RUS; BIBL. 11 REF.Article

CONTRIBUTION OF THE X-RAY EMISSION LINES TO IONIZATION OF LOWER IONOSPHERE.LETFUS V; APOSTOLOV EM.1974; PURE APPL. GEOPHYS.; SWITZ.; DA. 1974; VOL. 112; NO 4; PP. 647-653; BIBL. 11 REF.Article

RAYONNEMENT X DU SOLEIL EN JUILLET 1964 ET NOVEMBRE-DECEMBRE 1965 D'APRES LES DONNEES DU SATELLITE ELECTRON-4 ET LA STATION VENUS-2LETFUS V; TINDO IP.1972; KOSM. ISSLEDOV.; S.S.S.R.; DA. 1972; VOL. 10; NO 6; PP. 920-924; BIBL. 8REF.Serial Issue

SOME STATISTICAL CHARACTERISTICS OF ACTIVE REGIONS WITH THE YELLOW CORONAL LINELETFUS V; RUZICKOVA TOPOLOVA B.1973; BULL. ASTR. INST. CZECHOSL.; CZECHOSL.; DA. 1973; VOL. 24; NO 4; PP. 195-201; ABS. RUSSE; BIBL. 9 REF.Serial Issue

TIME VARIATION OF THE E-W ASYMMETRY OF FLARE NUMBERS WITH RESPECT TO THE PHASE OF SOLAR CYCLESLETFUS V; RUZICKOVA TOPOLOVA B.1980; BULL. ASTR. INST. CZECHOSL.; CSK; DA. 1980; VOL. 31; NO 4; PP. 232-239; ABS. RUS; BIBL. 14 REF.Article

TYPE VARIATION OF SOLAR SUDDEN FIELD ANOMALY (SFA) ON 164 KHZ AS AN INDICATOR OF SEASONAL STRUCTURE CHANGES IN THE D-REGIONLETFUS V; APOSTOLOV EM; NESTOROV G et al.1973; J. ATMOSPH. TERRESTR. PHYS.; G.B.; DA. 1973; VOL. 35; NO 3; PP. 571-576; BIBL. 11 REF.Serial Issue

ON THE POSSIBILITY OF IDENTIFYING CORONAL HOLES ON SYNOPTIC MAPS OF THE GREEN CORONALETFUS V; KULCAR L; SYKORA J et al.1980; SYMP. - INT. ASTRON. UNION; ISSN 0074-1809; NLD; DA. 1980; NO 91; PP. 49-53; BIBL. 11 REF.Conference Paper

EXPERIMENTAL EXAMINATION OF THE POSSIBLE INFLUENCE OF THE 1.87 A LINE EMISSION ON THE FINE STRUCTURE OF THE LOWER IONOSPHERE IONIZATION.LETFUS V; APOSTOLOV EM; NESTOROV GT et al.1978; PURE APPL. GEOPHYS.; SWITZ.; DA. 1978; VOL. 116; NO 1; PP. 1-7; BIBL. 16 REF.Article

PERIODICITIES IN TIME VARIATIONS OF IONIZATION STATE OF NIGHT LOWER IONOSPHERE.APOSTOLOV EM; LETFUS V; NESTOROV GT et al.1976; C.R. ACAD. BULG. SCI.; BULG.; DA. 1976; VOL. 29; NO 3; PP. 343-345; BIBL. 6 REF.Article

THE CONTRIBUTION OF THE SOLAR DISCRETE X-RAY SOURCES TO THE D-REGION IONIZATION DURING THE SOLAR ECLIPSE ON 20 MAY 1966.LETFUS V; APOSTOLOV EM; NESTOROV GT et al.1974; BULL. ASTR. INST. CZECHOSL.; CZECHOSL.; DA. 1974; VOL. 25; NO 5; PP. 262-267; ABS. RUSSE; BIBL. 7 REF.Article

SUNRISE EFFECT ON ATMOSPHERICS AND ITS RELATION TO THE DIRECTION OF THE NIGHT NOISE SOURCELETFUS V; APOSTOLOV EM; KLIMES J et al.1982; STUD. GEOPHYS. GEOD.; ISSN 0039-3169; CSK; DA. 1982; VOL. 26; NO 3; PP. 281-294; ABS. RUS; BIBL. 15 REF.Article

Long-term variation of the semi-annual wave maxima in geomagnetic activityAPOSTOLOV, E. M; LETFUS, V.Studia geophysica et geodaetica. 1989, Vol 33, Num 4, pp 379-390, issn 0039-3169Article

Quasi-biennial oscillations of the green corona intensityAPOSTOLOV, E. M; LETFUS, V.Bulletin of the Astronomical Institutes of Czechoslovakia. 1985, Vol 36, Num 4, pp 199-205, issn 0004-6248Article

Quasi-biennial oscillations of the solar wind velocitiesKULCAR, L; LETFUS, V.Bulletin of the Astronomical Institutes of Czechoslovakia. 1988, Vol 39, Num 6, pp 372-378, issn 0004-6248Article

Some characteristics of quasi-biennal geomagnetic oscillations of solar originAPOSTOLOV, E. M; LETFUS, V.Studia geophysica et geodaetica. 1988, Vol 32, Num 2, pp 171-186, issn 0039-3169Article

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