Premium
Revisiting geomagnetic activity at auroral latitudes: No need for regular quiet curve removal for geomagnetic activity indices based on hourly data
Author(s) -
Martini Daniel,
Argese Chiara,
Di Loreto Massimo,
Mursula Kalevi
Publication year - 2016
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2015ja022041
Subject(s) - earth's magnetic field , quiet , interplanetary magnetic field , magnetometer , geomagnetic secular variation , solar wind , geomagnetic latitude , variation (astronomy) , geodesy , space weather , latitude , residual , atmospheric sciences , environmental science , meteorology , mathematics , physics , magnetic field , geomagnetic storm , geology , astrophysics , algorithm , astronomy , quantum mechanics
The main objective of our study is to determine if the regular quiet daily curve (QDC) subtraction is a necessary procedure in quantifying the irregular geomagnetic variations at auroral latitudes. We define the hourly Δ H index, the absolute hour‐to‐hour deviation in nanotesla of the hourly geomagnetic horizontal component, which assigns each sample to sample deviation as geomagnetic activity without separating the “regular” and “irregular” parts of the daily magnetic field evolution. We demonstrate that the hourly gradient of the regular Sq variation is very small with respect to the irregular part, and a bulk of the nominal daily variation is actually part of the variation driven by solar wind and interplanetary magnetic field and traditionally classified as irregular. Therefore, attempts to subtract QDC can lead to a larger error, often caused by residual deviations between the used different mathematical and methodological tools and corresponding presumptions themselves. We show that Δ H provides the best and most consistent results at most timescales with the highest effective resolution among the studied indices. We also demonstrate that the Δ H index may equally be useful as a quick‐look near‐real‐time index of space weather and as a long‐term index derived from hourly magnetometer data for space climate studies.