Physics of auroral phenomena : proceedings of the 33rd Annual seminar, Apatity, 02 - 05 March, 2010 / [ed.: A.G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 206 с. : ил.

established. Magnetic recordings o f Kp observatories demanding clearings by means of the correlation analysis of magnetic recordings for each pair of observatories on excess correlation factor (|R |>0.5) is established. The signals on the selected magnetograms are decomposed in Fourier series and correlated with the high-latitude signal harmonics from the purified signal removed. The cleared corrected signal inverse Fourier transform is obtained. Then, repeating official algorithm o f calculation of the Kp-index on corrected magnetograms specified Kp index which is not containing superfluous influence polar electrojets we calculate. In a Fig. 3 «clearing» magnetogram example from observatories Meanook of calculation of Kp-index from the polar contribution registered at high-latitude station Yellowknife o f calculation of AE-index in disturbed day on January, 7th, 2004 is shown. Correlation between signals at performance of offered operation practically to zero decreases. The same pairs of magnetograms have been resulted earlier in a Fig. 1 where for them high correlation (more than 0.7) was marked. ^YKc) " Sync) = <1.0513 Kp index correction in order to eliminate excess impact o fhigh latitude magnetospheric disturbances Fig. 3. Normalized magnetograms for horizontal geomagnetic field component H and D in disturbed day on January, 7th, 2004. Magnetograms from Meanook observatory o f calculation of Kp-index of the polar contribution are cleared 4. Calculation of a new index on the basis of «cleared» magnetograms Results on calculation of the specified index of Kp for 2004 is presented. Coordinates of pairs observatories selected for realization of algorithm o f specification of an index are presented in Table 1. Here each middle-latitude observatory of Kp index is compared with high-latitude observatories. The high-latitude observatory is approximately on the same geomagnetic meridian as an observatory of calculation of Kp index (http:// www.wdc.bgs.ac.uk) . Table 1. Selection of the observatory pairs. Station Geomaj . coord. N« Code Ntm « Lat. Long. 1 LER* Lerwick 62.0* 89.2* SOO Sodankyla 63.7* 120.6* 2 MCA* Meanook 61.7* 305.7* YKC Yellowknife 69.1* 296.4* 3 SIT* Sirka 60.4* 279.8* C9B Cambridge Bay 76.7* 299.1* 4 ESK* Eskdalemuir 57.9* 83.9* HRN Homsund 73.5* 127.5* 5 UPS* Uppsala S8.5* 106.4* ABK Abidco 65.9* 115.4* 6 orr* Ottawa 5S.8* '3S5.0* PBQ Poste-de-la-Baleine 66-2* 350.2* 7 BFE* Brorfeide 55.4* 98.6* SOO Sodankyla 63.7* 120.6* 8 HAD* Hartland 54.0* 80.2* SOO Sodankyla 63.7* 120.6* 9 WNG* Wingst 54.1* 95.1* ABK Abisko 65.9* 115.4* 10 NGK* Ntemegk 51.9* 97.7* SOO Sodankyla 63.7* 120.6* 11 FRO* Fredericksburg 48.6* 353.1* P3Q Poste-de-la-Baleine 66.2* 350.2* 12 CNB* Canberra -42.9* 226.8* CMO College 65.1* 259.2* 13 EYR* Eyrewell 47.2* 253.8* CMO College 65.1* 259.2* Clearing of the superfluous polar contribution for each of the specified 13 pairs observatories is executed. At the final stage the official algorithm of calculation of an Kp index on corrected (cleared) magnetograms is realised. In a Fig. 4 the fragment of the calculated annual sequence o f the corrected three-hour values o f Kp index on an interval 15