Method of frequency dependent correlations: Investigating the variability of total solar irradiance

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@article{b333886fa7fb4f7c90c80bd7fef65315,
title = "Method of frequency dependent correlations: Investigating the variability of total solar irradiance",
abstract = "This paper contributes to the field of modeling and hindcasting of the total solar irradiance (TSI) based on different proxy data that extend further back in time than the TSI that is measured from satellites. We introduce a simple method to analyze persistent frequency-dependent correlations (FDCs) between the time series and use these correlations to hindcast missing historical TSI values. We try to avoid arbitrary choices of the free parameters of the model by computing them using an optimization procedure. The method can be regarded as a general tool for pairs of data sets, where correlating and anticorrelating components can be separated into non-overlapping regions in frequency domain. Our method is based on low-pass and band-pass filtering with a Gaussian transfer function combined with de-trending and computation of envelope curves. We find a major controversy between the historical proxies and satellite-measured targets: a large variance is detected between the low-frequency parts of targets, while the low-frequency proxy behavior of different measurement series is consistent with high precision. We also show that even though the rotational signal is not strongly manifested in the targets and proxies, it becomes clearly visible in FDC spectrum. The application of the new method to solar data allows us to obtain important insights into the different TSI modeling procedures and their capabilities for hindcasting based on the directly observed time intervals.",
keywords = "Astrophysics - Solar and Stellar Astrophysics, Physics - Data Analysis, Statistics and Probability, Physics - Geophysics, Methods: statistical, Solar-terrestrial relations, Sun: activity, Sun: magnetic fields, Sunspots",
author = "Jaan Pelt and Maarit K{\"a}pyl{\"a} and Nigul Olspert",
year = "2017",
month = "4",
day = "1",
doi = "10.1051/0004-6361/201527816",
language = "English",
volume = "600",
pages = "1--19",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",

}

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TY - JOUR

T1 - Method of frequency dependent correlations

T2 - Investigating the variability of total solar irradiance

AU - Pelt, Jaan

AU - Käpylä, Maarit

AU - Olspert, Nigul

PY - 2017/4/1

Y1 - 2017/4/1

N2 - This paper contributes to the field of modeling and hindcasting of the total solar irradiance (TSI) based on different proxy data that extend further back in time than the TSI that is measured from satellites. We introduce a simple method to analyze persistent frequency-dependent correlations (FDCs) between the time series and use these correlations to hindcast missing historical TSI values. We try to avoid arbitrary choices of the free parameters of the model by computing them using an optimization procedure. The method can be regarded as a general tool for pairs of data sets, where correlating and anticorrelating components can be separated into non-overlapping regions in frequency domain. Our method is based on low-pass and band-pass filtering with a Gaussian transfer function combined with de-trending and computation of envelope curves. We find a major controversy between the historical proxies and satellite-measured targets: a large variance is detected between the low-frequency parts of targets, while the low-frequency proxy behavior of different measurement series is consistent with high precision. We also show that even though the rotational signal is not strongly manifested in the targets and proxies, it becomes clearly visible in FDC spectrum. The application of the new method to solar data allows us to obtain important insights into the different TSI modeling procedures and their capabilities for hindcasting based on the directly observed time intervals.

AB - This paper contributes to the field of modeling and hindcasting of the total solar irradiance (TSI) based on different proxy data that extend further back in time than the TSI that is measured from satellites. We introduce a simple method to analyze persistent frequency-dependent correlations (FDCs) between the time series and use these correlations to hindcast missing historical TSI values. We try to avoid arbitrary choices of the free parameters of the model by computing them using an optimization procedure. The method can be regarded as a general tool for pairs of data sets, where correlating and anticorrelating components can be separated into non-overlapping regions in frequency domain. Our method is based on low-pass and band-pass filtering with a Gaussian transfer function combined with de-trending and computation of envelope curves. We find a major controversy between the historical proxies and satellite-measured targets: a large variance is detected between the low-frequency parts of targets, while the low-frequency proxy behavior of different measurement series is consistent with high precision. We also show that even though the rotational signal is not strongly manifested in the targets and proxies, it becomes clearly visible in FDC spectrum. The application of the new method to solar data allows us to obtain important insights into the different TSI modeling procedures and their capabilities for hindcasting based on the directly observed time intervals.

KW - Astrophysics - Solar and Stellar Astrophysics

KW - Physics - Data Analysis

KW - Statistics and Probability

KW - Physics - Geophysics

KW - Methods: statistical

KW - Solar-terrestrial relations

KW - Sun: activity

KW - Sun: magnetic fields

KW - Sunspots

U2 - 10.1051/0004-6361/201527816

DO - 10.1051/0004-6361/201527816

M3 - Article

VL - 600

SP - 1

EP - 19

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - A9

ER -

ID: 10322641