Helium ions predominance at low and middle latitudes during equinox in the 22nd solar activity cycle from observations aboard the "Interkosmos-24" satellite.

Details Helium ions predominance at low and middle latitudes during equinox in the 22nd solar activity cycle from observations aboard the "Interkosmos-24" satellite. Helium ions predominance at low and middle latitudes during equinox in the 22nd solar activity cycle from observations aboard the "Interkosmos-24" satellite.

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994kosis..32..155s&link_type=abstract

Kosmicheskie Issledovaniia, Tom 32, Vyp. 6, p. 155 - 164

Physics

Earth Atmosphere: Helium, Earth Atmosphere: Solar Activity Cycles

Scientific paper

He+ measurements by two independent methods (mass-spectrometric and probe) aboard "Intercosmos-24" satellite are presented. The steady He+ dominance and its high absolute density up to 3.5×104cm-3 at low and middle latitudes of both hemispheres in wide height range intervals between 700 and 2500 km during the spring equinox of 1991 at the end of three years period of maximum of the 22nd solar activity cycle was observed. Such absolute dominance of helium ions in wide longitude-height-latitude range during equinox in measurements by mass-spectrometric methods was shown practically for the first time. It was demonstrated that the He+ dominance is associated with declination sign. The conclusion about the influence of dynamical processes on He+ dominance was made. A map of height-latitude distribution of He+ dominance appearance is presented. The experimental and theoretical works available from literature relating to He+ behavior during the last four solar activity cycles were analysed.

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