Effects of time-dependent photoionization on interstellar pickup ions

Details Effects of time-dependent photoionization on interstellar pickup ions Effects of time-dependent photoionization on interstellar pickup ions

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10017053i&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A9, p. 17053-17058

Physics

Plasma Physics

3

Interplanetary Physics: Interstellar Gas, Solar Physics, Astrophysics, And Astronomy: Ultraviolet Emissions, Interplanetary Physics: Pickup Ions, Space Plasma Physics: Ionization Processes

Scientific paper

We present an analytical model for the density variations of interstellar pickup ions in the solar wind due to a time-dependent variation in the photoionization rate of the interstellar atoms. Following a sudden increase in the photoionization rate, our model predicts a pickup ion density enhancement lasting for a time of the order of the duration of the increase plus the solar wind convection time to the observation point. If the photoionization rate returns to its initial value, this enhancement is followed by a decreased pickup ion density resulting from a depleted interstellar neutral particle density. In the absence of further variations in the photoionization rate, the pickup ion density recovers on a time which scales as the radial position of the observation point divided by the inflow speed of the neutral particles. Gradual variations in the photoionization rate result in a pickup ion density which tends to track the ionization rate, though the density variations are smoothed and delayed in time due to the solar wind convection of ions picked up at points closer to the Sun.

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