lf 24 = 1007p Ww bo buJ Pd ' ‘ i = ' ' a 0.80 ‘ . \ k; Sunset ot midpoint ab 1954 | ' WwW a wn March 27 Apr. 1954 -~------6 Moy 9684 ——-——-i Le Lk pelt. if. pop jpop. 2 oco}\ 3 2 L +. = = 0.40 2 tot / J | We + ‘ fa Mt ais Seo py 4 N V -_ nN SAAR MO z NL a 4. \ ‘ nl ee | atoyt VLAN. CAL Zh N Mtr CH TA |' T/T . y! t Bu &w 0. ozoL YALL oO a | - , | tot nd tote | : w | 0000 i | / he | i Ty 0500 J tod. M17 7 Vv Ts Sunrise at midpoint I 1000 wo 1500 2000 2400 GREENWICH MEAN TIME Figure 20 Plot of the field strength of NPM as measured by DRL at Austin, Texas. FIELD STRENGTH (MILLIVOLTS PER METER) 1O.0}-- f+ 24 March !954 27 April 6 1964 -----eee May 1954 5.0 Sunrise ot mid ~4 t t t A {| Sunset at midpoint ! 0000 0500 V 1000 GREENWICH i500 2000 2400 MEAN TIME Figure 21 Plot of the field strength of NSS as measured by DRL at Austin, Texas, 38

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