Figure 3
Localized ozone loss associated with EMIC-driven IPA in the absence of a storm. (a) Global map of the mesospheric ozone (SABER, stars), REP (MEPED, triangles \(\ge 4\) counts), and aurora (superposition acquired from 22:18 to 27:32 UT by DMSP19/SSUSI). The black dot indicates the magnetic conjugate point of Fort Churchill (FCHU), Canada. (b) Magnified map (aurora taken at 24:07 UT by DMSP19/SSUSI). Black arrows indicate the orbit direction of the TIMED and POES satellites and the time information in parentheses is the measurement time for TIMED/SABER. Maps were generated by MATLAB R2020b, https://www.mathworks.com. (c) Tangent altitude profile of ozone by orbit 68,683 through the IPA. (d) Difference in the mesospheric ozone profiles. e EMIC/Pc1 wave activity on August 11, 2014, at FCHU. The black dotted line is the O + gyrofrequency at the magnetic equator estimated from an empirical geomagnetic field model41. Red lines indicate the time each instrument passed the same magnetic latitude of the IPA (~ 63°). Numbers in parentheses denote the orbit number of each satellite.
