Reliability of P mode event classification using contemporaneous BiSON and GOLF observations

TL;DR

This study compares the performance of BiSON and GOLF instruments in classifying P mode events, revealing that observational differences depend on the spectral line wing used by GOLF, affecting data consistency.

Contribution

It demonstrates how the spectral line wing choice in GOLF observations influences the agreement with BiSON data in P mode event classification.

Findings

GOLF data shows higher relative power during blue wing observations.

Good agreement between BiSON and GOLF during red wing observations.

Discrepancies are linked to the spectral line wing used by GOLF.

Abstract

We carried out a comparison of the signals seen in contemporaneous BiSON and GOLF data sets. Both instruments perform Doppler shift velocity measurements in integrated sunlight, although BiSON perform measurements from the two wings of potassium absorption line and GOLF from one wing of the NaD1 line. Discrepancies between the two datasets have been observed. We show,in fact, that the relative power depends on the wing in which GOLF data observes. During the blue wing period, the relative power is much higher than in BiSON datasets, while a good agreement has been observed during the red period.