The Polar Cusps of the Earth's Magnetosphere

Lavraud, B.; Trattner, K. J.

doi:10.1002/9781119815624.ch11

Cited by 4 publications

(2 citation statements)

References 101 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We direct our attention to a signature of magnetopause reconnection, which can be encountered in low Earth orbits (LEOs), and can be measured approximately 1-2 times every 90-100 min. We call this signature ion-energy dispersion in the cusp or simply a "dispersion event" (Basinska et al, 1992;Lavraud and Trattner, 2021). In this paper, we discuss two different types of dispersion, single dispersion and double dispersion, with double dispersion being rarer and the main focus of this paper.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of overlapping double ion energy dispersion events in the northern cusp

da Silva,

Chen,

Fuselier

et al. 2024

Front. Astron. Space Sci.

View full text Add to dashboard Cite

This article presents a statistical analysis of overlapping double ion-energy dispersion events in the northern cusp (“double dispersion”). Double dispersion in either cusp is a phenomenon associated with multiple reconnections occurring on the dayside magnetosphere as a result of its constant interaction with the variable solar wind. Using observations from a low Earth orbiting (LEO) Defense Meteorological Satellite Program (DMSP) satellite, we analyze 138 dayside events selected by the automatic algorithm extended from our previous work. We conducted a correlation study between the number of detected double dispersion events and 1) the month of the year to analyze the seasonal response of the cusp, and 2) solar wind interplanetary magnetic field (IMF) components and clock/cone angles to investigate its relationship with magnetic reconnection. We found that dispersion events occur more frequently during the northern summer months (i.e., when the dipole is tilted Sunward) and when the By component of IMF is positive. In addition, we provide a machine-readable list of the events and the code used to automatically detect the events.

show abstract

Section: Introductionmentioning

confidence: 99%

Statistical analysis of overlapping double ion energy dispersion events in the northern cusp

da Silva,

Chen,

Fuselier

et al. 2024

Front. Astron. Space Sci.

View full text Add to dashboard Cite

show abstract

“…

The magnetospheric cusps are regions with unique magnetic field topology, where the magnetic field lines converge on the surface of the Earth's poles (e.g., Chapman & Ferraro, 1931). They manifest as funnel-shaped regions of magnetopause (e.g., Crooker & Burke, 1991;Haerendel et al, 1978), and separate the dayside closed field lines from nightside stretched field lines (Lavraud & Trattner, 2021). The cusps play an important role in the solar wind-magnetosphere-ionosphere coupling.

…”

mentioning

confidence: 99%

An Auroral Signature of the Duskside Boundary of the Cusp

et al. 2022

View full text Add to dashboard Cite

The cusp is a region in which the solar wind plasma can directly penetrate into the ionosphere. Most previous studies mainly focused on the low‐ and high‐latitude boundaries of the cusps, the identification of the dawnside and duskside boundaries of them appears to be questionable. The auroras are the ionospheric manifestations of solar‐terrestrial energy coupling. This paper presents a new approach to diagnose the duskside boundary of the cusp with the observation of a particular polar cap arc (PCA) located near the ∼1500 magnetic local time sector (15MLT‐PCA). Using measurements from Defense Meteorological Satellite Program satellite, we selected several 15MLT‐PCA examples where the satellite flew over different regions and analyze the particle characteristics. We identified the precipitating particles in dawnside and duskside regions next to 15MLT‐PCA are from the low latitude boundary layer/cusp and boundary plasma sheet/central plasma sheet respectively. The statistical result further confirms our findings. Therefore, we proposed that 15MLT‐PCA can be used as an identifiable optical signature of the duskside boundary of the cusp. This paper provides a valuable approach to identify the cusp boundaries, and the results are critical for understanding the generation mechanism of 15MLT‐PCA.

show abstract

Global-Scale Processes and Effects of Magnetic Reconnection on the Geospace Environment

Fuselier,

Petrinec,

Reiff

et al. 2024

Space Sci Rev

View full text Add to dashboard Cite

Recent multi-point measurements, in particular from the Magnetospheric Multiscale (MMS) spacecraft, have advanced the understanding of micro-scale aspects of magnetic reconnection. In addition, the MMS mission, as part of the Heliospheric System Observatory, combined with recent advances in global magnetospheric modeling, have furthered the understanding of meso- and global-scale structure and consequences of reconnection. Magnetic reconnection at the dayside magnetopause and in the magnetotail are the drivers of the global Dungey cycle, a classical picture of global magnetospheric circulation. Some recent advances in the global structure and consequences of reconnection that are addressed here include a detailed understanding of the location and steadiness of reconnection at the dayside magnetopause, the importance of multiple plasma sources in the global circulation, and reconnection consequences in the magnetotail. These advances notwithstanding, there are important questions about global reconnection that remain. These questions focus on how multiple reconnection and reconnection variability fit into and complicate the Dungey Cycle picture of global magnetospheric circulation.

show abstract

The Polar Cusps of the Earth's Magnetosphere

Cited by 4 publications

References 101 publications

Statistical analysis of overlapping double ion energy dispersion events in the northern cusp

Statistical analysis of overlapping double ion energy dispersion events in the northern cusp

An Auroral Signature of the Duskside Boundary of the Cusp

Global-Scale Processes and Effects of Magnetic Reconnection on the Geospace Environment

Contact Info

Product

Resources

About