On the Connection Between Solar Activity and Low-Latitude Aurorae in the Period 1715 - 1860

Details On the Connection Between Solar Activity and Low-Latitude Aurorae in the Period 1715 - 1860 On the Connection Between Solar Activity and Low-Latitude Aurorae in the Period 1715 - 1860

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006soph..238..405v&link_type=abstract

Solar Physics, Volume 238, Issue 2, pp.405-420

Physics

3

Scientific paper

Observations of aurorae borealis at low latitudes are very rare and are clearly associated with strong geomagnetic storms. Morphologically, they are characterized by a diffuse red colour with no rapid motions. The main aim of this paper is to analyse two hitherto ignored aurorae that were observed at two low-latitude sites, Tenerife (28°N 18°W) and Mexico City (19°N 99°W), in 1770 and 1789, respectively. These observations can give supplementary information about the level of solar activity at those times where direct solar observations were rather scarce. Studying also the behaviour of the heliosphere during this period using different proxies, we find that the open magnetic field better describes auroral occurrences. The variation over time in geomagnetic latitude at the two sites is also calculated.

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