Author: James Patrick McFaddenPublisher:
ISBN:
Category :
Languages : en
Pages : 284
Book Description
A Sounding Rocket Study of Auroral Electron Precipitation
Author: James Patrick McFaddenPublisher:
ISBN:
Category :
Languages : en
Pages : 284
Book Description
Investigations of auroral electron precipitation by means of sounding rockets
Author: Rickard LundinRocket Measurements of Energetic Electron Precipitation in the Auroral Zone
Author: David S. EvansRocket Obervations of VLF Bursts, Electron Precipitation, and Ion Heating in the Auroral Ionosphere
Author: Gregory Townsend DeloryPublisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 286
Book Description
Electron Precipitations and Polar Auroras
Author: Ching I. MengPublisher:
ISBN:
Category :
Languages : en
Pages : 134
Book Description
In the first part a brief historical review of the progress of our knowledge of the precipitation of auroral electrons is given. Observations by different techniques, in terms of detectors aboard balloons, sounding rockets, and polar-orbiting satellites are reviewed. The precipitation morphology is examined in terms of synoptic statistical results and of latitudinal survey along individual satellite passes. In the second part, a large number of simultaneous observations of auroras and precipitating auroral electrons by DMSP satellites are examined in detail, and it is shown that precipitation characteristics of auroral electrons are distinctly different for the discrete aurora and the diffuse aurora. In the third part, the source region of auroral electrons is discussed by comparing the auroral electron precipitation at low altitudes observed by DMSP satellites with the simultaneous ATS-6 observations near the magnetospheric equatorial plane approximately along the same geomagnetic field line. It is shown that the diffuse aurora is caused by direct dumping of the plasma sheet electrons from the equatorial region, whereas discrete auroras require acceleration of electrons between the plasma sheet and the polar atmosphere. The parallel electric field along the geomagnetic field line above the ionosphere is a likely candidate for the acceleration mechanism. (Author).
A Study of the Auroral Substorm by Sounding Rocket
Author: Paul Marvin KintnerNuclear Science Abstracts
Author: Scientific and Technical Aerospace Reports
Author: Energy Research Abstracts
Author: In Situ Analysis of Measurement of Auroral Dynamics and Structure
Author: Meghan R. MellaPublisher:
ISBN:
Category :
Languages : en
Pages : 314
Book Description
Two auroral sounding rocket case studies, one in the dayside and one in the nightside, explore aspects of poleward boundary aurora. The nightside sounding rocket, Cascades-2 was launched on 20 March 2009 at 11:04:00 UT from the Poker Flat Research Range in Alaska, and flew across a series of poleward boundary intensifications (PBIs). Each of the crossings have fundamentally different in situ electron energy and pitch angle structure, and different ground optics images of visible aurora. The different particle distributions show signatures of both a quasistatic acceleration mechanism and an Alfvénic acceleration mechanism, as well as combinations of both. The Cascades-2 experiment is the first sounding rocket observation of a PBI sequence, enabling a detailed investigation of the electron signatures and optical aurora associated with various stages of a PBI sequence as it evolves from an Alfvénic to a more quasistatic structure. The dayside sounding rocket, Scifer-2 was launched on 18 January 2008 at 7:30 UT from the Andoya Rocket Range in Andenes, Norway. It flew northward through the cleft region during a Poleward Moving Auroral Form (PMAF) event. Both the dayside and the nightside flights observe dispersed, precipitating ions, each of a different nature. The dispersion signatures are dependent on, among other things, the MLT sector, altitude, source region, and precipitation mechanism. It is found that small changes in the shape of the dispersion have a large influence on whether the precipitation was localized or extended over a range of altitudes. It is also found that a single Maxwellian source will not replicate the data, but rather, a sum of Maxwellians of different temperature, similar to a Kappa distribution, most closely reproduces the data. The various particle signatures are used to argue that both events have similar magnetospheric drivers, that is, Bursty Bulk Flows in the magnetotail.