Other
Scientific paper
Jun 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968natur.218.1238s&link_type=abstract
Nature, Volume 218, Issue 5148, pp. 1238-1239 (1968).
Other
2
Scientific paper
AT the Zvenigorod Station of the Institute of Physics of the Atmosphere of the USSR Academy of Sciences, regular observations on hydroxyl emission have been conducted for more than a decade1-3. Irregular observations on hydroxyl emission have also been conducted at some other stations during the IGY and the IQSY4. Fig. 1 shows average seasonal and average variations from year to year of the rotational temperature and the intensity of hydroxyl emission obtained at Zvenigorod. Only data not distorted by geomagnetic activity exceeding Kp >= 5 were used in the averaging. It has already been noted that there are some indications of variations of the intensity and the rotational temperature of hydroxyl emission with increasing geomagnetic activity5. In the analysis of some geomagnetic storms, however, this effect has been strongly masked by ordinary variations of hydroxyl emission with time. The interest in variations of hydroxyl emission was stimulated by the possibility of using these data to estimate planetary energy releases during auroral displays and substorms6. This is based on the fact that during these phenomena there is an additional dissociation of atmospheric molecules into atoms. Additional hydroxyl emission appears as a result of the recombination into molecules. To avoid masking the effect, caused by ordinary variations of the intensity and the rotational temperature of the hydroxyl emission with time, seasonal and solar cycle variations in the intensity and rotational temperatures were excluded, on the basis of the data in Fig. 1. The data were grouped according to magnetic storms into intervals defined by the Kp indices: (5-,50,5+), (6-,60,6+), (7-,70,7+), (8-,80,8+) and (9-,90). During the averaging, data on the intensity and the rotational temperature of hydroxyl emission were combined during the same intervals prior to and after the moment when magnetic perturbation had the maximum Kp index within one of the aforementioned groups. Fig. 2 shows by way of illustration a result for group Kp = (8-,80,8+). It is evident that variations of the increments of the intensity ΔI and the rotational temperature ΔT continue for a few days after the commencement of a geomagnetic storm, that is, for a much longer period than variations of the average Kp indices. This effect also occurs for the other Kp intervals. As a result of integration ΔI over the variations after a magnetic disturbance, values for the additional energy release ΔE of the hydroxyl emission appearing after the commencement of a geomagnetic storm have been obtained for the five ranges of geomagnetic activity. Table 1 lists these results. To calculate the total energy release of hydroxyl emission for all bands, relative intensities already published7 may be used. Similar variations of hydroxyl emission have been detected in data from other stations4 lying within the latitude range 60°-0°. The amplitude of the first maximum of ΔI decreases towards equatorial regions, while the additional energy release ΔE becomes zero at latitudes less than about 30°-40°. At the same time the average hydroxyl emission intensity at latitudes near 60° N. is approximately three times that at latitudes near 30°-40° N. It should be noted that at more southern stations the effect of geomagnetic storms exhibits itself a few days later than in high-latitude regions. The lag increases monotonically towards the equator. Near the equator the lag is about 10 days from the beginning of the storm.
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