What question did this study set out to answer?

To identify and characterize the physical mechanisms responsible for perpendicular oxygen ion energization and heating in the auroral magnetosphere at an altitude of approximately 1700 km.

March 1, 1998Journal of Geophysical Research AtmospheresOpen Access

Ion energization mechanisms at 1700 km in the auroral region

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Authors

MAM. AndréSwedish Institute of Space Physics PNP. NorqvistUmeå University LAL. AnderssonUniversity of Colorado Boulder

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Implication

Satellite observational study reveals broadband low-frequency waves drive transverse oxygen ion heating in the auroral magnetosphere, indicating wave resonance as the primary energization driver.

Key Points

To identify and characterize the physical mechanisms responsible for perpendicular oxygen ion energization and heating in the auroral magnetosphere at an altitude of approximately 1700 km.
Analyzed Freja satellite measurements of ions, electrons, plasma densities, electric and magnetic wave fields, and field-aligned currents at high latitudes around 1700 km.
Conducted detailed case evaluations of 3 heating events, a statistical analysis of 20 events, and classification of over 200 events into four categories distributed by magnetic local time.
Broadband low-frequency electric wave fields (<1 Hz to several hundred Hz) were the most frequent driver, producing the strongest O+ heating with mean ion energies reaching hundreds of eV.
Heating primarily occurred through wave resonance near the 25 Hz O+ gyrofrequency and was closely linked to Alfvén waves up to a few hertz and field-aligned currents.
Less common heating events were driven by waves near the lower hybrid frequency or half the proton gyrofrequency, generated by auroral electrons or precipitating ions.

Cite This Study

André et al. (1998) studied this question.

synapsesocial.com/papers/6a6f7ec2f44fa9f079dcf1ef https://doi.org/10.1029/97ja00855

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Implication

Satellite observational study reveals broadband low-frequency waves drive transverse oxygen ion heating in the auroral magnetosphere, indicating wave resonance as the primary energization driver.

Ion energization mechanisms at 1700 km in the auroral region

Discussion

Member takes

Implication

Key Points

Cite This Study

Ion energization mechanisms at 1700 km in the auroral region

Discussion

Member takes

Implication

Key Points

Cite This Study

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