| Satellite and Ground-Based Observations of Auroral Energy Deposition and the Effects on Thermospheric Composition During Large Geomagnetic Storms: 1. Great Geomagnetic Storm of 20 November 2003 |
2008 |
30 pages |
| Authors:
J. H. Hecht; T. Mulligan; D. J. Strickland; A. J. Kochenash; Y. Murayama; Y.-M Tanaka; D. S. Evans; M. G. Conde; E. F. Donovan; F. J. Rich; D. MORRISON; AIR FORCE RESEARCH LAB HANSCOM AFB MA
|
 | The great geomagnetic storm of 20-21 November 2003 was associated with the passage of magnetic cloud past the earth. The changes in thermospheric composition and particle precipitation are compared to those observed during geomagnetic activity on 17 November 2003, and during the intervening quieter period. We used data from (1) ground-based magnetometers, an imaging riometer, a scanning Doppler imaging Fabry-Perot, and photometers from stations in Alaska (2) photometers from Canadian ... |
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| A Space-Based Proxy for the Dst Index |
18 MAY 2007 |
8 pages |
| Authors:
F. J. Rich; J. M. Bono; W. J. Burke; L. C. Gentile; AIR FORCE RESEARCH LAB HANSCOM AFB MA
|
| The Dst index was created to monitor and quantify disturbances in the inner magnetosphere using ground-based, magnetic field measurements. The phases and strengths of geomagnetic storms are usually defined by the evolution of Dst. The standard Dst database is computed and maintained at the World Data Center for Geomagnetism, Kyoto. We demonstrate that the Dst index can also be approximated using magnetometers on spacecraft in near-Earth orbit. Measurements used in ... |
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| On the Relationship of SAPS to Storm-Enhanced Density |
2007 |
12 pages |
| Authors:
J. C. Foster; W. Rideout; B. Sandel; W. T. Forrester; F. J. Rich; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
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| We use magnetic field-aligned mapping between the ionosphere and the magnetosphere to intercompare ground-based observations of storm enhanced density (SED), and plasmasphere drainage plumes imaged from space by the IMAGE EUV imager, with the enhanced inner-magnetosphere/ionosphere SAPS electric field which develops during large storms. We find that the inner edge of the SAPS electric field overlaps the erosion plume and that plume material is carried sunward in the SAPS overlap ... |
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| The AFRL Auroral Boundary Algorithm |
30 JAN 2006 |
46 pages |
| Authors:
M. P. Hagen; E. G. Holeman; W. J. Burke; F. J. Rich; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
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| The AFRL algorithm obtains equatorward boundaries of auroral precipitation from electron fluxes measured by SSJ sensors on DMSP satellites. Gussenhoven and coworkers provided the empirical basis for the algorithm, showing that auroral boundaries correlate linearly with the Kp geomagnetic index. This report describes (a) the DMSP database, (b) derived statistical parameters, (c) tests performed on these statistics, and (d) the utility of test results. We illustrate the algorithm's method of ... |
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| Near-Simultaneous Plasma Structuring in the Midlatitude and Equatorial Ionosphere During Magnetic Superstorms |
29 APR 2005 |
5 pages |
| Authors:
Santimay Basu; Sunanda Basu; Keith M. Groves; Eileen MacKenzie; M. J. Keskinen; F. J. Rich; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
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| Near simultaneous formation of ionospheric plasma density structures at middle and equatorial latitudes during the intense magnetic storms of October 29-31, 2003; July 15, 2000; and March 30-31, 2001 is investigated. The evolution of these structures is explored by measuring amplitude scintillation of satellite signals at 250 MHz, determining zonal irregularity drifts and by detecting equatorial plasma bubbles with DMSP satellites. During abrupt decreases of SYM-H (1-minute resolution Dst) that ... |
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| The Major Magnetic Storm of March 13-14, 1989 and Associated Ionosphere Effects |
30 JUN 1993 |
17 pages |
| Authors:
F. J. Rich; W. F. Denig; PHILLIPS LAB HANSCOM AFB MA
|
| The geomagnetic storm of March 1989 was the largest geomagnetic storm of the decade and one of the largest of the century. We review many of the 'high-latitude' ionospheric observations that were made during this storm. Most of the data presented here comes from the polar-orbiting satellites of the Defense Meteorological Satellite Program (DMSP) series. A review of the DMSP data shows that most of the high-latitude, top-side ionospheric disturbance ... |
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| Characteristics of Suprathermal Electron Bursts Observed by the DMSP-F6/ F7 Satellites in the Diffuse Aurora Region |
1993 |
23 pages |
| Authors:
H. Nakajima; H. Fukunishi; T. Ono; F. J. Rich; PHILLIPS LAB HANSCOM AFB MA
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| Comparison of Ionospheric Electrical Conductances Inferred from Coincident Radar and Spacecraft Measurements and Photoionization Models |
1993 |
7 pages |
| Authors:
J. Watermann; O. De La Beaujardiere; F. J. Rich; PHILLIPS LAB HANSCOM AFB MA
|
| Height-integrated electrical conductivities (conductances) inferred from coincident Sondrestrom incoherent scatter radar and DMSP-F7 observations in the high-latitude ionosphere during solar minimum are compared with results from photoionization models. We use radar and spacecraft measurements in combination with atmospheric and ionospheric models to distinguish between the contributions of the two main sources of ionization of the thermosphere, namely, solar UV/EUV radiation and auroral electron precipitation. The model of Robinson et al. ... |
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| The Relationship Between Ion and Electron Precipitation Patterns and Field-Aligned Current Systems During a Substorm, |
19 MAY 1992 |
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| Authors:
T. Iijima; M. Watanabe; T. A. Poterma; L. J. Zanetti; F. J. Rich; PHILLIPS LAB HANSCOM AFB MA
|
 | We show in this study the persistency of large-scale characteristics in auroral particle precipitation patterns during a prolonged disturbed period which included a growth phase and multiple expansion onsets. The north-south conjugacy of these patterns and their relationship with the field-aligned currents are also discussed. We have investigated these characteristics by using the magnetic field and the plasma measurements acquired with the DMSP F7 satellite at an altitude of approximately ... |
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| Snapshots of High-Latitude Electrodynamics Using Viking and DMSP F7 Observations |
17 FEB 1989 |
16 pages |
| Authors:
G. T. Marklund; L. G. Blomberg; K. Stasiewicz; J. S. Murphree; R. Pottelette; L. J. Zanetti; T. A. Potemra; D. A. Hardy; F. J. Rich; AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
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| Simultaneous observations by the Viking and the DMSP F7 satellites have been used as input to a new method to obtain snapshot pictures of the auroral electrodynamics. In particular, an instantaneous global equipotential (or convection) pattern is calculated from distributions of field-aligned current and conductivity which are qualitatively consistent with the Viking auroral imager data and quantitatively consistent with magnetic field and particle data from the two satellites. This convection ... |
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