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The existence of this slow wind structure in association with a pseudostreamer directly contradicts the expansion factor model, which predicts that pseudostreamers produce fast wind. This case study found one clear periodic structure in the slow solar wind preceding the pseudostreamer in Wind/ACE and the same periodic structure in the in situ data at STEREO-B. We examined in situ alpha density and proton density data from the Wind, ACE, STEREO-B, AND STEREO-A spacecraft, focusing on a pseudostreamer that occurred August 9, 2008. Therefore, compositional changes in the alpha to proton ratio must have originated at the Sun, making alphs tracer particles of sorts and carrying signatures of their solar creation. Alpha particles compose about 4% of the solar wind, and its precise composition is determined by dynamics in the solar atmosphere. However, short term (~hours) variability of alpha particles could provide the set of observations that tips the balance. Both flux tube geometry of field lines open to the heliosphere and magnetic reconnection that opens field lines that were previously closed to the heliosphere have been proposed as explanations (via the expansion factor and S-web models, respectively), but the observations to date have proven an inadequate test for distinguishing between the theories. The origin of the slow solar wind has puzzled scientists for decades. Periodic Alpha Signatures and the Origins of the Slow Solar Wind From this result it is shown that spacecraft Lyman- alpha observations are more sensitive to the latitudinal anisotropy for a spacecraft location in the inner solar system near the downwind axis. The latitudinal variation of interplanetary hydrogen gas, arising from the solar wind latitudinal variation, is shown to be most pronounced in the inner solar system. Using both the Mariner 10 results and other solar wind observations, the values of the solar wind flux and velocity with latitude are determined for several cases of interest. This increase is caused by a latitudinal variation of the solar wind velocity and/or flux. The analysis of Mariner 10 observations of Lyman- alpha resonance radiation shows an increase of interplanetary neutral hydrogen densities above the solar poles. Polar solar wind and interstellar wind properties from interplanetary Lyman- alpha radiation measurements