Journal cover Journal topic
Annales Geophysicae Sun, Earth, planets, and planetary systems An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/angeo-2018-6
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Regular paper
19 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).
A relation between the locations of the polar boundary of outer electron radiation belt and the equatorial boundary of the auroral oval
Maria O. Riazanteseva1, Elizaveta E. Antonova2,1, Marina V. Stepanova3, Boris V. Marjin2, Ilia A. Rubinshtein2, Vera O. Barinova2, and Nikita V. Sotnikov2 1Space Research Institute (IKI) Russian Academy of Science, Moscow, Russia
2Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
3Physics Department, Universidad de Santiago de Chile (USACH)
Abstract. Finding the position of the external boundary of the outer electron radiation belt, relative to the position of the auroral oval, is a long-standing problem. Here we analyze it using data of the Meteor-M No. 1 auroral satellite for the period from 11 November 2009 to 27 March 2010. The geomagnetic conditions during the analyzed period were comparatively quiet. Meteor-M No. 1 has a polar solar-synchronous circular orbit with an altitude of ~ 832 km, a period of 101.3 min, and an inclination of 98°. We analyze flux observations of auroral electrons with energies between 0.03 and 16 keV, and electrons with energies > 100 keV, measured simultaneously by the GGAK-M set of instruments, composed by semiconductors, scintillator detectors, and electrostatic analyzers. We assume that at the absence of geomagnetic storms the external boundary of the outer radiation belt can be identified as a decrease in the count rate of precipitating energetic electrons to the background level. It was found that this boundary can be located both inside the auroral oval or to the equator from the equatorial boundary of the auroral precipitations. It was also found that for disturbed geomagnetic conditions the external boundary of the outer radiation belt is almost always located inside the auroral oval. We observe that the difference between the position of the outer boundary of the outer radiation belt and the position of the equatorial boundary of auroral precipitations depends on the AE and PC indexes of geomagnetic activity. The implications of these results in the analysis of the formation of the outer radiation belt is discussed.

Citation: Riazanteseva, M. O., Antonova, E. E., Stepanova, M. V., Marjin, B. V., Rubinshtein, I. A., Barinova, V. O., and Sotnikov, N. V.: A relation between the locations of the polar boundary of outer electron radiation belt and the equatorial boundary of the auroral oval, Ann. Geophys. Discuss., https://doi.org/10.5194/angeo-2018-6, in review, 2018.
Maria O. Riazanteseva et al.
Maria O. Riazanteseva et al.
Maria O. Riazanteseva et al.

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Short summary
The position of the external boundary of the outer electron radiation belt(ORB), relative to the auroral oval's position is hard to determine. It was done using simultaneous measurements of energetic and auroral electrons onboard METEOR-M1 satellite. Our analysis shows that the ORB boundary is often located inside the auroral oval and the number of such events increases with growing of geomagnetic activity. These results are relevant to our understanding of the topology of the geomagnetic field.
The position of the external boundary of the outer electron radiation belt(ORB), relative to the...
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