====== Telecon Notes March 4, 2021 ======

[[https://spa-zzz-01.spa.umn.edu/!ipsig/foregrounds|Link to main foregrounds telecons page]] \\
[[https://spa-zzz-01.spa.umn.edu/!ipsig/logbook|Link to logbook]]

Attendance:  Shaul, Kris, Ragnhild, Clem, Mathieu \\
Regrets:  \\

Agenda:
  * Update from Kris 
  * Commander simulations - Oslo + Clem

Notes: Shaul \\

=== Updates === 

   * Kris gives an update on his work on low frequency foregrounds
     * unpublished evidence from Quijote for significant variation of synchrotron beta
     * Planck data for \ell>100 is dominated by noise, so we don't know the small scale structure
     * Kris has a prescription for filling in small scale structure in a non-gaussian way; reminder: PySM is gaussian fill-in, so the new procedure is interesting, but Kris is not yet saying how the filling is done. 
     * Brandon mentions that people (e.g. Clark) suggest using HI data. Kris says he is not using HI data. 
     * Discussion of \ell relevance: agreement that this is all relevant for lensing reconstruction at high \ell, not for low \ell data. MR points out that there is an indirect effect: averaging of small scales to larger patches will impact the large angular scale data as well. 

   * Clem understands the reservations HK has regarding the signal. Simulations will need to be done with higher resolution. He is more puzzled about the noise issues.