Simultaneous Precipitation of Sub‐Relativistic Electron Microburst and Pulsating Aurora Electrons

Namekawa, T.; Mitani, T.; Asamura, K.; Miyoshi, Y.; Hosokawa, K.; Lessard, M.; Moser, C.; Halford, A. J.; Sakanoi, T.; Kawamura, M.; Nose, M.; Nomura, R.; Teramoto, M.; Shumko, M.; Lynch, K. A.; Jaynes, A. N.; McHarg, M. G.

doi:10.1029/2023gl104001

Cited by 4 publications

(1 citation statement)

References 59 publications

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“…More details of the LAMP mission will be shown elsewhere. The first paper using the LAMP data was recently published by Namekawa et al (2023), who studied an energy-time dispersion of precipitating electron flux in the energy range of 6.7-580 keV within a pulsating aurora patch.…”

Section: Lamp Sounding Rocket Missionmentioning

confidence: 99%

Field‐Aligned Currents Associated With Pulsating Auroral Patches: Observation With Magneto‐Impedance Magnetometer (MIM) Onboard Loss Through Auroral Microburst Pulsations (LAMP) Sounding Rocket

Nosé,

Hosokawa,

Nomura

et al. 2024

JGR Space Physics

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We made observations of magnetic field variations in association with pulsating auroras with the magneto‐impedance sensor magnetometer (MIM) carried by the Loss through Auroral Microburst Pulsations (LAMP) sounding rocket that was launched at 11:27:30 UT on 5 March 2022 from Poker Flat Research Range, Alaska. At an altitude of 200–250 km, MIM detected clear enhancements of the magnetic field by 15–25 nT in both the northward and westward components. From simultaneous observations with the ground all‐sky camera, we found that the footprint of LAMP at the 100 km altitude was located near the center of a pulsating auroral patch. The auroral patch had a dimension of ∼90 km in latitude and ∼25 km in longitude, and its major axis was inclined toward northwest. These observations were compared with results of a simple model calculation, in which local electron precipitation into the thin‐layer ionosphere causes an elliptical auroral patch. The conductivity within the patch is enhanced in the background electric field and as a result, the magnetic field variations are induced around the auroral patch. The model calculation results can explain the MIM observations if the electric field points toward southeast and one of the model parameters is adjusted. We conclude that the pulsating auroral patch in this event was associated with a one‐pair field‐aligned current that consists of downward (upward) currents at the poleward (equatorward) edge of the patch. This current structure is maintained even if the auroral patch is latitudinally elongated.

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Section: Lamp Sounding Rocket Missionmentioning

confidence: 99%

Field‐Aligned Currents Associated With Pulsating Auroral Patches: Observation With Magneto‐Impedance Magnetometer (MIM) Onboard Loss Through Auroral Microburst Pulsations (LAMP) Sounding Rocket

Nosé,

Hosokawa,

Nomura

et al. 2024

JGR Space Physics

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Optical measurements of precipitating relativistic electron microbursts during geomagnetic disturbance and pulsating aurora

Klimov,

Nikolaeva,

Shchelkanov

et al. 2024

Advances in Space Research

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Variation of the Altitude of Auroral Emission During a Substorm Cycle: Stereoscopic Optical Observations During the LAMP Rocket Experiment

Hosokawa,

Miyoshi,

Mcharg

et al. 2024

JGR Space Physics

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We estimated the altitude of aurora by combining data from all‐sky cameras at multiple places which were obtained during the LAMP sounding rocket experiment in Alaska on 5 March 2022. During the launch window of the rocket, three high‐speed all‐sky cameras were operative at three stations immediately below the trajectory of the rocket: Poker Flat, Venetie and Fort Yukon. The all‐sky cameras captured all‐sky images with a temporal resolution of 100 Hz (80 Hz for the Fort Yukon case). The method of altitude determination is based on analyses of time‐series of the optical intensity obtained from the all‐sky cameras in Venetie and Poker Flat covering the downrange area of the rocket trajectory. The estimated altitude of pulsating aurora during the rocket experiment was found to be consistent with that derived from the in‐situ observation of precipitating electrons with a model of optical emission, which confirms the feasibility of deriving the emission altitude through correlation analyses using time‐series. The estimated altitude of aurora decreased after the expansion onset of the substorm and stayed slightly below 100 km during the interval of pulsating aurora in the recovery phase. In particular, prompt and brief lowering of the auroral emission, well down to around 90 km, was detected during a transition of auroral form from discrete to diffuse which occurred ∼10 min after the onset. This result implies an existence of a process causing harder electron precipitation operative soon after the start of the expansion phase of auroral substorm.

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Simultaneous Precipitation of Sub‐Relativistic Electron Microburst and Pulsating Aurora Electrons

Cited by 4 publications

References 59 publications

Field‐Aligned Currents Associated With Pulsating Auroral Patches: Observation With Magneto‐Impedance Magnetometer (MIM) Onboard Loss Through Auroral Microburst Pulsations (LAMP) Sounding Rocket

Field‐Aligned Currents Associated With Pulsating Auroral Patches: Observation With Magneto‐Impedance Magnetometer (MIM) Onboard Loss Through Auroral Microburst Pulsations (LAMP) Sounding Rocket

Optical measurements of precipitating relativistic electron microbursts during geomagnetic disturbance and pulsating aurora

Variation of the Altitude of Auroral Emission During a Substorm Cycle: Stereoscopic Optical Observations During the LAMP Rocket Experiment

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