Effects of solar variability on thermosphere density from CHAMP accelerometer data

the effect of traffic density on the accident externality from driving the case study of tehran

در این پژوهش به بررسی اثر افزایش ترافیک بر روی تعداد تصادفات پرداخته شده است. به این منظور 30 تقاطع در شهر تهران بطور تصادفی انتخاب گردید و تعداد تصادفات ماهیانه در این تقاطعات در طول سالهای 89-90 از سازمان کنترل ترافیک شهر تهران استخراج گردید و با استفاده از مدل داده های تابلویی و نرم افزار eviews مدل خطی و درجه دوم تخمین زده شد و در نهایت این نتیجه حاصل شد که تقاطعات پر ترافیک تر تعداد تصادفا...

Solar Flux Variability and Mars’ Thermosphere Densities Derived from Orbital Tracking Data

Influence of solar variability on the infrared radiative cooling of the thermosphere from 2002 to 2014

Infrared radiative cooling of the thermosphere by carbon dioxide (CO2, 15 µm) and by nitric oxide (NO, 5.3 µm) has been observed for 12 years by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics satellite. For the first time we present a record of the two most important thermospheric infrared c...

Solar Cycle Variability of the Thermospheres of Mars and Earth

This paper comparatively examines long-term variations in the thermospheres of Mars and Earth, from the solar maximum of 2002-2003 to the deep solar minimum of 2009-2010. Data employed include densities and exosphere temperatures derived from orbital drag analyses of the Mars Odyssey (MO) satellite for Mars, and accelerometer measurements on the CHAMP satellite for Earth. Derivation of thermosp...

Thermosphere Density Variability , Drag Coefficients , and Precision Satellite Orbits

Precision orbit ephemerides (POE) are used to estimate atmospheric density along the orbits of CHAMP (Challenging Minisatellite Payload) and GRACE (Gravity Recovery and Climate Experiment). The densities are calibrated against accelerometer derived densities and considering ballistic coefficient estimation results. The 14-hour density solutions are stitched together using a linear weighted blen...