Аскаплоты полярных сияний за 1971 г. / Рос. акад. наук, Кол. науч. центр, Поляр. геофиз. ин-т. – Апатиты : Кольский научный центр РАН, 1997. - 68 с.

INTRODUCTION This issue contains the data obtained at stations in Arctic and Antarctic regions during 1971. Auroral data are presented in form o f ascaplots as adopted at Moscow IAGA Assemly in September, 1958. The list o f stations and their co-ordinates are shown in Table 1. Ascaplots o f 1972-1986 were published earlier/4/. Ascaplots present the information on aurora occurrence in three latitudinal intervals (north, zenith, south) each corresponding to three degrees o f latitude. Auroral activity in the zenith region is given in three index scale. Data are given for half hour intervals o f observations. The ascaplots contain information about clouds and moon lighting as well. The technique o f ascaploting is shown. Original data from all stations are stored in the Auroral Subcenter. The ascaplots have been prepared by L.N.Smirnova and N .N . Safa rgaleeva, the workers o f Auroral Subcenter. DESCRIPTION OF ASCAPLOTS INTRODUCTION . The present issue contains publication o f auroral data obtained by all sky cameras at stations during 1971. The stations are listed in Table 1. The third column presents conventional designations o f stations according to the Agreement adopted at IGY /1 ,2 /. The stations that did not operate during IGY (the number after 115) obtained their designations in the same way by compiling their ordinal numbers and three Latin letters denoting the name o f the station. Geographic and corrected geomagnetic co-ordinates (calculated after /3 /) are given in the 4th and 5th columns, respectively. The 6th column presents local geomagnetic midnight in UT for the given station. The last but one column lists the names o f the observers in chief. According to Moscow IAGA Assembly resolution o f 1958 it is desirable, when using askafilms, to refer to or name the person who obtained the askafilms. Auroral data are presented in the form o f ascaplots as adopted at Moscow IAGA Assembly in 1958. TTie technique o f ascaploting was suggested by V.Stoffregen who was the editor o f two volumes o f ascaplot data from the global network o f stations for 1957-1958 and 1958-1959 /1 ,2 /. Auroral observational data o f Arctic and Antarctic stations for 1972-1986 were published in /4 /. Ascaplots provide operative information about the time and place o f auroral observations and about some auroral parameters. INSTRUMENTS AND PROGRAM OF OBSERVATIONS. Observations at stations were carried out by all sky cameras designed by Prof. A.I.Lebedinsky /5 /. The optical system o f the instrument consists o f two spherical mirrors and a camera working automatically. The program o f observations included synchronous per minute filming with 20 s exposure (centered to the zero second) during the whole dark time when atmospheric precipitations were absent. For auroras occurring in the zenith o r in the case o f increased auroral brightness up to index 2 and more an additional 5 s exposure was turned on. Filming started and ended at the solar zenith angle o f 99. Under such conditions the stars o f the 2d stellar magnitude are seen at the sky background. A patrol filming with 20 s exposure was taken every 5 minute at complete o r partial clouds. Observations at the whole network o f stations were run in UT. All the negatives o f the stations are stored in the Auroral Subcenter o f World Data Center WDC B2 in Apatity (Auroral Subcenter, Polar Geophysical Institute, Apatity, Murmansk region, 184200, Russia). METHODS OF ASCAPLOTING. Information about auroras for every station according to /1 ,2 / is encoded in 5 lines divided by vertical bare. One vertical division corresponds to a half-an-hour interval centered at the beginning and middle o f each hour (UT). The local geomagnetic midnight is marked with a circle under the ascaplots. Three upper lines show aurora location in the sky. The upper black square demonstrates 7