I * . 4 I 1- X-640-66-174 , QUASI-BIENNIAL VARIATIONS OF COSMIC-RAY INTENSITIES GPO PRICE s CFSTl PRICE(S) $ t - - 2 Hard czpy (HC) J#rn Microfiche (MF) ,d ff653 July65 APRIL 1966 '(CODE) A ICATEOORY) TER https://ntrs.nasa.gov/search.jsp?R=19660021061 2020-06-17T01:45:24+00:00Z
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QUASI-BIENNIAL VARIATIONS OF COSMIC-RAY …...Quasi-Biennial Variations of Cosmic-Ray Intensities Abstract Owing to the atmospheric temperature effect on cosmic-rays, the so-called
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I * .
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I
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X-640-66-174 ,
QUASI-BIENNIAL VARIATIONS OF COSMIC-RAY INTENSITIES
The cosmic-ray data used in the present analysis are obtained
through the courtesy of Dr. S. E. Forbush at the Carnegie
Institution of Washington, D. C., to whom we are very gratefUl. We
wish also to express our appreciation to Prof. R. T. Reed at the
University of Washington, who has kindly advised us to use a part
of his latest results as well as his early findings.
- 14 -
Figure Captions
Figure 1
Figure 2
Figure 3
Coefficients of the partial temperature e f f e c t
( i n Lg/g cm-' O C ) for cosmic-ray in t ens i ty a t sea
l e v e l with cut-off energies, Eo = 0.3, 10 and 40
Gev, p lo t ted against atmospheric depth x ( i n
g an-*).
pos i t ive (production) e f f ec t , cr(E0,x) and negative
(decay) effect , -fl(Eo,x), respect ively.
Nl l ines and dashed l i n e s stand f o r
Composite coeff ic ient of t he partial temperature
e f fec ts i n l i n e a r scale, y(E0,x) i n '%/g 'C,
derived from Fig. 1.
The 26-month var ia t ions of t rop ica l s t ra tospher ic
temperatures (AT)* a t Canton Island (3' S) and
zonal wind at Balboa (8' N) given by Reed (1965)
fo r the period from 191 t o 1961. The full l i n e
~~ ~~
* The temperature difference between Canton Island and f i v e subtropical Since the var ia t ion a t the la t te r s t a t i o n s (average l a t i t u d e 27' N ) .
i s very small as compared t o the one at the equator, AT can be regarded as the va r i a t ion a t Canton Island.
- 13 -
Figure 4
Figure 5
in the lower portion is a similar expression of
the ion-chamber data from Huancayo (12' S) based
on 5-Q days in each month. Dashed line and dots
are the first and the second harmonics of the
full-line.
Dashed lines are theoretical estimations correspond-
ing to AT-curves in the upper portion of the
figure computed by coefficients Shawn in Fig. 2,
where heavy dash-dot and thin dash-dot lines
correspond to the cut-off energies, Eo = 0.3 Gev
and 10 Gev, respectively.
Power spectrum (Periodogram) of Huancayo (12' S )
ion-chamber data based on 5-H days in each month
for the period from 1937 to 1961.
scale is arbitrary and T in the horizontal scale
is in months.
The vertical
Power spectrum of Godhavn (69O23' N) ion-chamber
data for the period from 1947 to 1939.
3-H stand for the data of five quiet days and
five high counting days in each month.
5-Q and
Figure 6
- 16 -
The folded-average curves of cosmic-ray muon data
from Lae (6'44' S), where horizontal scale
indicates the length of folding and v e r t i c a l scale
is r e l a t ive cosmic-ray in t ens i ty corrected fo r
barametric e f fec t . The meaning of 5-Q and 5-H
m e the same as Fig. 5 . The bottom curves
correspond t o the r e l a t ive var ia t ion with a mean
value normalized t o lo@.
\
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43. Danvillier, A * , Les Rayons Cosmignes, Dunod, Paris, 1954.
.
a
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t- -I 4 F ; lo-6
IO -7 1 I Eo = 0.3 GeV
I I 1
0 200 400 600 800 1,000 iP00 ATMOSPHERIC DEPTH x IN g/om2
1.8xlO-'
.6
.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-0.2
- 0.4
I - I
2
\ I
- v - EoZ0.3 GeV ._
1 0 0 200 300 400 SO0 600 700 800 900
ATMOSPHERIC DEPTH x IN g/cm*
- A L 3 - 2 0
- 4 1 - 2 0
1 2o 10
0
- 10
- 4
JAN JAN JAN JAN JAN JAN JAN JAN JAN JAN JAN 60 58 56 54 52 61 59 57 55 53 51
1
D
c 5
Figure 3
10- '
t= a z
z 10'2 w I-
oc - m a
10- 3
1 0 - ~
HUANCAYO ( 12"s geographic 1 5 - H MAX LAG = 120 MONTH