Solar wind latitudinal variations deduced from Mariner 10 interplanetary H /1216 A/ observations

Details Solar wind latitudinal variations deduced from Mariner 10 interplanetary H /1216 A/ observations Solar wind latitudinal variations deduced from Mariner 10 interplanetary H /1216 A/ observations

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....73..272w&link_type=abstract

Astronomy and Astrophysics, vol. 73, no. 3, Mar. 1979, p. 272-281.

Astronomy and Astrophysics

Astronomy

25

Astronomical Models, Hydrogen Atoms, Interplanetary Medium, Mariner 10 Space Probe, Solar Wind, Spaceborne Astronomy, Density Distribution, Lyman Alpha Radiation, Neutral Particles, Particle Flux Density, Solar Activity Effects, Sunspots

Scientific paper

The Mariner 10 H (1216-A) interplanetary observations are examined by using models that consider anisotropies in the solar fluxes. It is verified that the dominant contribution to asymmetric structure in the Mariner 10 H (1216-A) data is a latitudinal variation of the solar-wind flux and of the solar wind velocity, leading to a hydrogen atom lifetime that is latitude dependent. The average lifetime at 1 AU is found to increase from the solar equator to the solar poles by about 25%. This allows interstellar hydrogen to penetrate closer to the solar poles than to the equator. A general analytic model is constructed for evaluating the neutral hydrogen density distribution in interplanetary space. This model takes into account the latitude-dependent ionization rate. When this model is applied to the Mariner 10 H (1216-A) data, it is shown to be capable of matching the observations with a statistical accuracy of 5%. The effect of this latitudinal variation on H (1216-A) sky background maps is to produce a latitudinal shift in the maximum toward the north ecliptic pole.

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