Many thanks for the link .However, while the paper is convincing in term of theoretical orbital mechanics, I can't find any treatment of using solar sail attitude alone to manage torque and acceleration issues, for as the authors state, it "does not address practicality issues such as the design and deployment of the sunshades"
The closest the seem to come to my quetioni : " in section I in Results and Discussion, the outcome of the geoengineering optimizations is an out-of-plane motion of the type z(t) = a sin(t + c) + b. Thus, we then know that the sail acceleration in the out-of-plane direction must be such that: (19) We may also require that the sunshade does not move away from the Sun-Earth line, i.e. y = 0, so that the shade is always cast symmetrically over the morning and afternoon side of the Earth. Thus,(20) Precisely because of the two previous constraints, the control history of the clock angle δ must then satisfy:(21) On the other hand, the control history of the cone angle α must also satisfy the following expression:(22) If Eqs 21 <https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0136648#pone.0136648.e030> and 22 <https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0136648#pone.0136648.e031> are satisfied, the shape of the motion in the z and y coordinates will be as prescribed, and only x(t) remains to be solved." Which is fine by way of celestial mechanics, but not much use in terms of how to evolve sail to keep a 100 kilometer square rigger on tation in all kinds of space weather On Sunday, May 3, 2020 at 7:11:26 PM UTC-4, Douglas MacMartin wrote: > > See > https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0136648 > > > > This is straightforward to calculate, and wouldn’t be any more difficult > to find than L1. (That is, solar pressure is well known, so is gravity.) > > > > > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to geoengineering+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/9f32f167-7894-4c9e-8680-d3ff28bd80e9%40googlegroups.com.
