[Isocops] Discussion about incorporation of Bzowski's Survival Probabilities

[McComas, Dave]

Thanks Nathan!

Everyone - Nathan has now defined the data processing that will be used for the ongoing second time variation paper that we will also use to roll data in maps 3-5 (and possibly 6) in S/C frame as well as CG corrected and summed maps. These will provide an update of the publically available data as well the improved data that IBEX team members should be using for their studies. Please do not implement additional "improvements" or "refinements" in the data corrections beyond that without Nathan's explicit permission.

Thanks,
Dave

David J. McComas, Ph.D. 
Assistant Vice President 
Space Science and Engineering Division 
Southwest Research Institute 


-----Original Message-----
From: Nathan Schwadron [mailto:nschwadron at guero.sr.unh.edu] 
Sent: Monday, November 14, 2011 3:21 PM
To: McComas, Dave; Bob DeMajistre; Maher Dayeh
Cc: isoc cops
Subject: Discussion about incorporation of Bzowski's Survival Probabilities

Hi All

We have reached consensus today that the best path forward for the IBEX maps is to incorporate survival prob from Bzowski and analytic solutions for deflection and energy change through the heliosphere. There are many advantages to this approach. I am sending this email so that we will take this path forward and freeze the system once implemented. Rationale is below; however, it is vital at this stage that we take this approach and don't veer from the development path. 

Cheers

Nathan

Rationale: The analytic corrections due to angle deflection and energy change are very small and depend only on one parameter, mu: the path integrated radiation pressure force divided by gravitational force. This makes it straightforward to implement the software and then we can find the best value of mu based on comparison with Bzowski model results. The other advantage with this approach is that it can be implemented on the timeframe needed. In terms of correctness of the approximation, the corrections are so small that any differences between the analytic solutions and results from Bzowski for angle deflection and energy change will be barely detectable in the solutions. 

Nathan Schwadron
n.schwadron at unh.edu

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