top of the low-latitude ionospheric O market research to the diffusion flux

Title: top of the low-latitude ionospheric O ~ + market research to the diffusion flux Author: Chen Guangming Degree-granting units: Graduate School of Chinese Academy of Sciences (Space Science and Applied Research Center) Keywords: top ionosphere;; diffusion flux;; occultation;; incoherent scatter radar;; electron density;; atmospheric density Abstract: This paper consists of two parts of the Magnetic lifter content, the top of the first part of the ionosphere to the diffusion flux of O + field studies, respectively, of CHAMP
COSMIC constellation of satellites and Research longevity of solar activity and solar activity was low diffusion flux in the low magnetic latitude statistical characteristics, but also benefit
With incoherent scatter radar data analysis of the magnetic storm the top of the ionosphere at mid-latitude flux diffusion characteristics; second part of the analysis of the CHAMP Health
The in situ observations and satellite data, including atmospheric density, electron density, electron temperature, atmospheric density presented inversion method, and had close
Degree models of the initial exploration, this part has a strong application. Part I: at the top of ionospheric O + field study of the diffusion flux
. Diffusion fluxes, and plasma layer of the ionosphere / inner magnetosphere coupling dynamics and quality of research is very important, the electrical
Ionosphere and thermosphere coupling study of the dynamics is also important, but also help people to analyze clearly the role of ambipolar diffusion and neutral wind
, Electric field and the chemical processes and other physical processes of the relative impact of ionospheric structure size. Diffusion flux is still a lot of global ionospheric
- Hot on the boundary layer model one http://www.999magnet.com/products/131-magnetic-lifter of the conditions necessary, such as the NCAR-TIEGCM and TING model. (1) the use of CHAMP satellite data study
Study of solar activity longevity at the top of ionospheric O + field statistical characteristics of the diffusion flux. This paper from the plasma motion equation, with CHAMP Health
Star of the electron density profile data, combined with empirical models IRI2007 and NRLMSISE00, calculated at the top of the ionosphere to the diffusion rate of O + field and
Diffusion flux, and analyzed in January 2002 - December 2003 period the rate of diffusion of low latitude magnetic flux and diffusion characteristics. Results Table
That, in low magnetic latitudes, hmF2 +100 km altitude, the average spread rate of about -15 ms-1 ~ 25 ms-1; daytime plasma
Diffusion rate from the downward direction with height (poloidal) and gradually turned up (to the equator), the height of the direction of change left in hmF2 +50 km
Right. In magnetic latitude and upward diffusion flux and diffusion velocity maximum at noon. During the day, the magnetic latitude ± 25 ° around the region had the largest
Upward plasma diffusion flux and magnetic flux of the equatorial region of the plasma is very small. In the O + diffusion flux points on the magnetic equator of the basic
That the winter hemisphere significantly larger than the plasma diffusion flux of the summer hemisphere. (2) the use of COSMIC satellite data to study solar
Low activity in the top of the ionosphere to the diffusion flux of O + field statistical characteristics. The use of COSMIC occultation data of the first 300 days in 2006 to
In 2007 the first 300 days at the top of ionospheric O + field to the diffusion rate and diffusion fluxes, and analysis of their global distribution and diurnal variation. During the day
Higher altitudes (hmF2 +80 km above), the latitude plasma diffusion speed up; at night, the direction of the diffusion rate down. In white
Days of high altitude, in the north and south magnetic latitude 10 ° ~ 20 ° about the existence of the direction of maximum diffusion rate and the upward diffusion flux; and at night, in the
North and south magnetic latitude 30 ° ~ 40 ° or so, there is the direction of maximum diffusion rate and the downward diffusion flux. In sub-point, spread through the northern and southern hemispheres
Volume and diffusion rate roughly symmetrical, and in to the point, the diffusion flux of the northern and southern hemispheres there is a clear asymmetry, the higher high during the day
Degree (such as hmF2 +80 km above), the low-latitude summer hemisphere in the rate of diffusion and the diffusion flux was significantly higher than the winter hemisphere, and to the point at
Lower altitudes (such as hmF2 +50 km), there is no such feature, even in winter hemisphere diffusion rate is also higher than the summer hemisphere. Other
, The diffusion rate of different latitudes have different diurnal variation. CHAMP and COSMIC data through data comparison of research results, development
Low solar activity is now spread through the years, the maximum value is less than the value of longevity of solar activity. (3) the use of incoherent scatter radar data
O + diffusion flux when the magnetic storm of variation. In this paper, Millstone Hill incoherent scatter radar (288.5 ° E, 42.6 ° N) concept
Measured electron density, electron temperature and ion temperature profiles to calculate the diffusion flux, and the two magnetic storms in October 2002 during the ionization
Layer diffusion flux, diffusion rate and the variation of relevant parameters were analyzed. Found in the 500 km altitude, the two main storm
Phase during the upward diffusion flux during the day significantly reduced, at night down the diffusion flux increased significantly; storm recovery phase in the two phase
, The night quiet period observed smaller than the diffusion rate during certain hours or even its direction to upward. Part II: the use of
CHAMP satellite observations in situ thermal and ionospheric research. (1) atmospheric density studies. Describes the use of
Of CHAMP accelerometer data and related measurements inversion method of upper atmosphere density and try to use the data to establish the density of the atmosphere
Empirical models. As more satellites containing accelerometers running, the findings have broad application prospects.
(2) electron temperature and electron density studies. Langmuir probe using CHAMP satellite observations, analysis of the electron temperature and electron density
Year variation and their relationship with solar activity. Degree Year: 2009