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Particle-precipitation fine structure during the development of substorms at high latitudes |
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| Authors: | I V Despirak V Kh Gineva Zh V Dashkevich |
| Institution: | 1. Polar Geophysical Institute, Apatity Division, Kola Scientific Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmansk oblast, 184209, Russia 2. Institute of Space Research and Technologies, Bulgarian Academy of Sciences, Stara Zagora, Bulgaria |
| Abstract: | The energy of precipitating particles that cause auroras can be characterized by the ratio of different atom and molecule emissions in the upper atmospheric layers. It is known that the spectrum of precipitating electrons becomes harder when substorms develop. The ratio of the I 6300 red line to the I 5577 green line was used to determine the precipitating-electron spectrum hardness. The I 6300/I 5577 parameter was used to roughly estimate the electron energy in auroral arcs observed in different zones of the auroral bulge at the bulge poleward edge and within this bulge. The variations in the emission red and green lines in auroral arcs during substorms that occurred in the winter season 2007–2008 and in January 2006 were analyzed based on the zenith photometer and all-sky camera data at the Barentsburg and Longyearbyen (LYR) high-latitude observatories. It has been indicated that the average value of the I 6300/I 5577 emission ratio for arcs within the auroral bulge is larger than this value at the bulge poleward edge. This means that the highest-energy electron precipitation is observed in arcs at the poleward edge of the substorm auroral bulge. |
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