 |
DTIC ADA210522: The Auroral Energy Deposition Over the Polar Ionosp... |
 |
by Defense Technical Information Center |
 |
Thumbnail |
|
Download |
 |
Web page |
|
|
|
The global Joule heating distributions are estimated |
|
through the magnetogram inversion method. This study |
|
employs instantaneous ionospheric conductance |
|
distributions deduced from the DMSP-F6 bremsstrahlung |
|
Xray image data. Also estimated from the Xray data are |
|
instantaneous global particle heating distributions. The |
|
two heating distributions thus obtained allow us to |
|
investigate various aspects of heat energy processes over |
|
the polar ionosphere on an instantaneous basis. A special |
|
emphasis is placed on their spatial and temporal |
|
behaviors. Several important results of this study are |
|
summarized as follows: (1) Regions of significant Joule |
|
heating are closely associated with the auroral |
|
electrojets prominently in the dawn and dusk sectors. (2) |
|
The major Joule heating usually occurs poleward of the |
|
major particle heating region, particularly in the |
|
morning sector. On the other hand, the two heating |
|
patterns are complementary in the longitudinal direction. |
|
(3) There is a higher correlation between the global |
|
Joule heating rate (U Sub J) and AE(12) than between the |
|
global particle heating rate (U Sub A) and AE(12). (4) |
|
The particle heating rate tends to be more prominent |
|
during the maximum phase of substorms and afterward than |
|
during the pre-expansion phase. (5) The U Sub J/U Sub A |
|
ratio varies by more than a factor of 10, suggesting the |
|
wide variability in the relative importance of the two |
|
heating rates. On the average, however, U Sub J is larger |
|
than U Sub A by a factor of 6. |
|
|
|
Date Published: 2018-02-22 22:41:15 |
|
Identifier: DTIC_ADA210522 |
|
Item Size: 24910970 |
|
Language: english |
|
Media Type: texts |
|
|
|
# Topics |
|
DTIC Archive; Ahn, B -H ; AEROSPACE C... |
|
|
|
# Collections |
|
dticarchive |
|
additional_collections |
|
|
|
# Uploaded by |
|
@chris85 |
|
|
|
# Similar Items |
|
View similar items |
|
|
|
PHAROS |
|
