EPTA meeting, Paris - Jun 2026

Session

Noise modelling session

3 juin 2026, 09:00

APC

23. Probing turbulence in the interstellar medium with long-term dispersion and rotation measure variations of young pulsars

Selah Melfor

03/06/2026 09:00

Radio waves emitted by pulsars experience a frequency-dependence propagation effect caused by free elections in the ionized interstellar medium (IISM), parameterized by the dispersion measure (DM). Temporal variations in the DM of pulsars provide a powerful probe of the density fluctuations of the free electrons in the ionized interstellar medium. These variations provide insight into the...

19. Investigating Interstellar Turbulence in HII Regions with LOFAR Pulsars

Francesco Iraci (APC, CNRS)

03/06/2026 09:20

Interstellar turbulence critically influences the propagation of pulsar radio signals, affecting both the timing precision and the interpretation of interstellar plasma properties. While its statistical behaviour in the diffuse ionised medium is relatively well described by a Kolmogorov-like spectrum, the nature of turbulence within discrete structures such as HII regions remains poorly...

8. An Elegant FD Formulation for a More Civilized PTA Age

Sofia Sosa Fiscella (ASTRON)

03/06/2026 09:40

Radio pulsars exhibit frequency-dependent variations in the shape of their pulse profiles that introduce systematic delays in the pulse times of arrival (TOA) across an observing band. Some Pulsar Timing Arrays model these delays using a frequency-dependent (FD) log-polynomial function whose coefficients are fit to TOA measurements. However, these FD parameters are prone to absorbing power...

18. Solar wind variations in DR2low

Mark Brionne (INAF-OA Cagliari)

03/06/2026 10:00

DR3 will add low-frequency data from LOFAR and NenuFAR. A characteristic of low-frequency pulsar observations is their high sensitivity to the diverse effects of propagation through a plasma. Adding these data is thereby useful for determining the various chromatic noises more accurately. In addition to being more sensitive to interstellar medium variations, low-frequency data become sensitive...