2012
DOI: 10.5194/angeo-30-1567-2012
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Anisotropic pitch angle distribution of ~100 keV microburst electrons in the loss cone: measurements from STSAT-1

Abstract: Abstract. Electron microburst energy spectra in the range of 170 keV to 360 keV have been measured using two solid-state detectors onboard the low-altitude (680 km), polar-orbiting Korean STSAT-1 (Science and Technology SATellite-1). Applying a unique capability of the spacecraft attitude control system, microburst energy spectra have been accurately resolved into two components: perpendicular to and parallel to the geomagnetic field direction. The former measures trapped electrons and the latter those electro… Show more

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Cited by 11 publications
(11 citation statements)
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“…For each microburst shown in Figure , its flux was averaged and baseline subtracted using the method from O'Brien et al () and then fit with an exponential function. The calculated exponential E‐folding energy was found to vary between 25 and 35 keV, which is consistent with spectra derived from prior measurements (Datta et al, ; Lee et al, , ).…”
Section: Discussionsupporting
confidence: 87%
See 1 more Smart Citation
“…For each microburst shown in Figure , its flux was averaged and baseline subtracted using the method from O'Brien et al () and then fit with an exponential function. The calculated exponential E‐folding energy was found to vary between 25 and 35 keV, which is consistent with spectra derived from prior measurements (Datta et al, ; Lee et al, , ).…”
Section: Discussionsupporting
confidence: 87%
“…Empirical and theoretical analyses indicate that microbursts are an important loss process since they can substantially deplete the radiation belt electrons on the order of 1 day (e.g., Breneman et al, ; Lorentzen et al, ; O'Brien et al, ; Thorne et al, ). Previously, microbursts have been observed in the upper atmosphere in the form of bremsstrahlung X‐rays (e.g., Anderson et al, ; Parks, ; Woodger et al, ) and directly in low Earth orbit (LEO; e.g., Blake et al, ; Blum et al, ; Breneman et al, ; Crew et al, ; Lee et al, , ; Lorentzen et al, , ; Mozer et al, ; Nakamura et al, , ; O'Brien et al, , ).…”
Section: Introductionmentioning
confidence: 99%
“…[]). There have been several reports on microbursts in the subrelativistic [e.g., Parks , ; Lee et al ., ] and relativistic energy range [e.g., Imhof et al ., ; Nakamura et al ., ]. The model of Miyoshi et al .…”
Section: Computer Simulations and Discussionmentioning
confidence: 99%
“…Lee et al . [], using the STSAT‐1 data, have shown that ~170 to 360 keV electron data at ~680 km altitude exhibited a two‐component spectra. The precipitation component parallel to the ambient magnetic field lines were softer than the perpendicular (trapped) component.…”
Section: Introductionmentioning
confidence: 98%