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Influence of Geomagnetic Activity on Derivation of Temperatures From Meteor Wind Radars
Author(s) -
Hall C. M.,
Johnsen M. G.
Publication year - 2020
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2020rs007123
Subject(s) - earth's magnetic field , meteor (satellite) , altitude (triangle) , atmospheric sciences , thermosphere , environmental science , meteorology , metric (unit) , ionosphere , geophysics , physics , geology , mathematics , magnetic field , geometry , operations management , economics , quantum mechanics
Echoes from meteor trails can be analyzed to derive diffusion coefficient and thereafter estimates of neutral temperatures, typically around 90 km altitude. The method entails some assumptions and, usually, use of model pressures. Even so, variations in derived temperatures have been assumed to be representative and indicators of other mesospheric processes. However, we now find that the observed variations, seen as enhancements, are very closely associated with enhancements in geomagnetic activity. Here we introduce a metric for describing geomagnetic activity (as an alternative to, e.g., the k ‐index) and suggest a methodology for near‐real‐time correction of results.