Correspondence between the latitudinal ULF wave power distribution and auroral oval in conjugate ionospheres

Abstract

Abstract. We examine the Pc5 wave power latitudinal distribution in the morning sector along the conjugate magnetometer arrays in Greenland and Antarctica. These distributions are compared with the location of the auroral oval, reconstructed using the OVATION-prime model. This model makes it possible to reconstruct separately the spatial structures of diffuse and monoenergetic precipitation of auroral electrons. Mapping of the spectral power of narrowband Pc5 waves onto the auroral oval has shown that the wave power in the morning sector is localized inside the auroral oval, namely at the poleward edge of diffuse precipitation, but near the peak of monoenergetic precipitation. The case analysis results have been confirmed by a larger statistical study. This observational result confirms the effects earlier found in case studies: the spatial/temporal variations of Pc5 wave power are closely related to the location of the auroral electrojet and magnetospheric field-aligned currents. From the observed relationship between the wave power and the auroral boundaries, it may be concluded that the poleward edge of the diffuse precipitation, around the maximum of the monoenergetic precipitation, is preferred latitude of magnetospheric field-line resonance excitation. This effect is not taken into account by modern theories of ULF Pc5 waves.

Interhemispheric Asymmetries in the Ground Magnetic Response to Interplanetary Shocks: The Role of Shock Impact Angle

“…DTU data are obtained from the public Tromsø Geophysical Observatory website (http://flux.phys.uit.no/geomag.html), while AAL‐PIP data are obtained from the public Magnetosphere‐Ionosphere Science Team (MIST) website (mist.nianet.org). AAL‐PIP data have been used to investigate interhemispheric asymmetries in ground‐ and space‐located magnetic perturbations (Hartinger et al, , ; Martines‐Bedenko et al, ; Xu et al, ).…”

“…DTU data are obtained from the public Tromsø Geophysical Observatory website (http://flux.phys.uit.no/geomag.html), while AAL-PIP data are obtained from the public Magnetosphere-Ionosphere Science Team (MIST) website (mist.nianet.org). AAL-PIP data have been used to investigate interhemispheric asymmetries in groundand space-located magnetic perturbations (Hartinger et al, 2016(Hartinger et al, , 2017Martines-Bedenko et al, 2018;Xu et al, 2017). By design, the AAL-PIP stations were placed at the magnetic conjugate points of the DTU stations, as determined through use of the International Geomagnetic Reference Field (IGRF).…”

The 2021 Antarctic Total Eclipse: Ground Magnetometer and GNSS Wave Observations From the 40 Degree Magnetic Meridian

“…(1964). Many studies have been conducted on the properties of ULF waves at high latitudes (Constantinescu et al., 2009; Martines‐Bedenko et al., 2018; V. Pilipenko et al., 2015; V. A. Pilipenko et al., 2019; Simms et al., 2006) in order to characterize their behavior. Furthermore, much has been published on the mechanisms that drive ULF waves in the magnetosphere (Anderson, 1993; Takahashi et al., 2021; Turc et al., 2022).…”

“…These waves, as observed by ground-based magnetometers, fall into the ultra-low frequency (ULF) classification as in Jacobs et al (1964). Many studies have been conducted on the properties of ULF waves at high latitudes (Constantinescu et al, 2009;Martines-Bedenko et al, 2018;V. Pilipenko et al, 2015;V.…”

The 2021 Antarctic Total Eclipse: Ground Magnetometer and GNSS Wave Observations from the 40 Degree Magnetic Meridian

“…These waves, as observed by groundbased magnetometers, fall into the ultra-low frequency (ULF) classification as in Jacobs et al (1964). Many studies have been conducted on the properties of ULF waves at high latitudes (Simms et al, 2006;Martines-Bedenko et al, 2018;V. Pilipenko et al, 2015;V.…”