RELATION OF IONOSPHERIC AND MAGNETIC DISTURBANCES IN HAIGH LATITUDES FROM DATA OBTAINED IN MURMANSK.

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80T00246A005400350006-8
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 2
• Document Creation Date: December 21, 2016
• Document Release Date: January 5, 2009
• Sequence Number: 6
• Content Type: REPORT

Approved For Release 2009/01/05: CIA-RDP80T00246AO05400350006-8
R.A.ZEVAKINA
RELATION OF IONOSPHERIC AND MAGNETIC DISTURB, S
IN HAIGH LATITUDES FROM DATA OBTAINED IN
MURMANSK.
As a result of the study of anomalous changes in ionosphere
during magnetic storms and bay-like disturbances of the
geomagnetic field based on the observations in J:Iurmansk for
1954-1957 it Was concluded that:
1, In high latitudes magnetic storms and bays are accompa -
nied by anomalous changes, mainly, in the 1 er ionosphere.
During the disturbances most frequent are a considerable increase
of the critical frequencies r'f the layer Es and a full or
enchansed absorption. Anrmalous changes of frF2 at the time
of disturbances were not often observed, approximately in 20
per cent of the disturbances. During the bays and the storms
reflecti'ns from the l::yers ? Es and F2 'ere happened to be
diffusive.
2. The nature of anomalous changes of the ionosphere
and magnetic field changes during 24 hours and with the season.
The morning hours are frequently characterized by full absorpt-
ion, day hours- by intensified absorption and evening hours-by
anomalous changes of f''F2, night hours- high values of fEB. The
anomalous changes of f?F2 are distributed within 24 hours as
follows negative values of 4- f?F2, prevailing at duy time turn
into positive at evening hours. The character of magnetic dis-
turbance also changes v'ith the time of the day. Night and
morning hours (21-6 hours) are usually accompanied by negative
bays, day and evening (from 12 till 21 hours)- by positive.
Storms are more often beginning at 16 to 24 hours, ending at
0 to 8 hours. In the day distribution of magnetic activity there
are three ,maxima to be distinguished: at 20-22 hours, 2-3
and 14-17 hours in the local time.
The following variation of -ionospheric disturbances has
been discovered. During the year full absorption is more frequ-
ent at the equinox and minter time', intensified absorption and
high day time values of fEs- in summer, high night values of
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f?F2 are more often met in v;inter. The character of season
variations of anomalous phenomena of ionosphere some`;hat changes
with the rise of solar activity, During the years of loner solar
activity full end intensified absorption is the most frequent
at the equinox periods, during the years of high solar activity
the maximum of full absorption falls on sinter, the maximum of
the intensified absorption - on summer. The frequency of appea-
rance of all disturbing elements except fEs ~ 4 megacycles
rises rith the growth of solar activity.
3. Great agreement among anomalous changes in th' lo,-rcr
ionosphere and magnetic disturbances testifies to the f-ct th^t
magnetic disturbances in high latitudes are caused by the
processes developing in the ionosphere during the corpuscular
intrusion, mainly, at the height of 100 kn. Megnetic disturban-
ces are probably caused bya strong violation and change of the
current system responsible for the quiet daily variations.
Approved For Release 2009/01/05: CIA-RDP80T00246AO05400350006-8