GEOPHYSICAL OBSERVATORY REPORTS, YEAR 1985 - NAGYCENK GEOPHYSICAL OBSERVATORY (Sopron, 1986)

1985 - I. EART CURRENTS

I. EARTH CURRENTS The coordinates of the Observatory are: <p = 47"38' X= 16°43' Ф= 47.2" /f= 98.3" All times are given in CET (i.e. UT + lh), nearly (—7 min) corresponding to LT. The tables published in this part are the following: I. The activity indices T of the general activity for each three hour inter­val of the local day, as well as the character figures of single frequency bands for whole days Ki—Кг,. The T-sca'e is linear; its steps correspond to 1.8 mV/km. The monthly mean T-valures are separately given for the North-South and East-West com­ponents. The scales for Ki—K.-, are as follows: See also Part V. о this Report (p 137) on an unexplained change in the apparent scale value of the component Ev. All values in the table are given in units of 10"5 V/km. Values in brackets mean extrapolated ones from incomplete material, where the lacking hours have been substituted by the average of recorded hours. II. Monthly and yearly means, and means for disturbed and quiet days of the amplitudes of the former frequency bands and of the earth current field intensity. D and Q days are the same as in section Geomagnetism. The rows 1—5 contain the average amplitudes of the five bands in 10~D V/km. Row 6 con­tains the hourly means of the earth current scalar intensity corrected for long period variation (equally in 10"5 V/km). III. Results of harmonical analyses from monthly means of the earth current scalar intensity. IV. Time of special events (common table from magnetic and earth current records). limits between K-values Frequency band 0—1 1—2 2—3 3—4 4—5 5—6 6—7 7—8 8—9 1. Period 0— 2 min 2 4 7 13 18 23 29 41 54 2. Period 2— 6 min. 9 13 18 23 29 34 41 56 90 3. Period 6—12 min 16 22 25 32 38 45 56 83 120 4. Period 12—24 min. 34 43 54 70 85 101 124 151 202 5. Period 24—60 mni. 29 43 67 88 110 131 191 234 339

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