Response of the thermosphere to Joule heating and particle precipitation

Wilson, G. R.; Weimer, D. R.; Wise, J. O.; Marcos, F. A.

doi:10.1029/2005ja011274

Cited by 71 publications

(90 citation statements)

References 24 publications

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“…[36] Following upon the methods used by Burke [2008] and Wilson et al [2006], the total auroral heating from the W05 model is used to calculate DT c values as a function of time, employing a differential equation that increases the temperature in proportion to the heating energy input and decreasing the temperature with an exponential cooling. In numerical form, the temperature at time step n + 1 is derived from that at the prior step by…”

Section: Derivation Of Dt C From Auroral Heatingmentioning

confidence: 99%

“…[16] A quantitative test of ionospheric heating computed with the W05 model was reported by Wilson et al [2006], who compared the model's calculations with observations of neutral density distributions derived from 6 months of measurements from the Air Force High Accuracy Satellite Drag Model (HASDM). HASDM was developed by the Air Force to improve their satellite orbit prediction capability [Storz et al, 2002].…”

Section: Introductionmentioning

confidence: 99%

“…The J77 model consists of a set of density and temperature profiles, each uniquely specified by an exospheric temperature T ∞ . In following up on the method used by Wilson et al [2006], Burke [2008] used an analysis of the J77 tables to calculate the total volume-integrated gravitational potential energy of the thermosphere above an altitude of 100 km, as well as adding in the smaller amount thermal energy. They found that this total energy is linearly related to the average exospheric temperature by where E th is the total energy of the thermosphere above 100 km in Joules.…”

Section: Introductionmentioning

confidence: 99%

“…[17] For the comparison with the W05 model heating, Wilson et al [2006] derived a quantity called DTPE 200 , which is the change in gravitational potential energy for the thermosphere above 200 km altitude. This quantity is obtained from the HASDM output by integrating the product of the change in mass density as a function of position and the gravitational potential.…”

Section: Introductionmentioning

confidence: 99%

“…[19] Wilson et al [2006] fit the DTPE 200 curves with a simple differential equation as a means to compare the energy inputs with the changes in total energy and also to account for losses due to a gradual exponential cooling. Burke [2008] and Burke et al [2009] further developed this concept that the thermosphere acts as a "driven-dissipative thermodynamic system," showing that a powerful method for modeling the time evolution of the thermosphere is to simply keep track of the total energy budget of heat going in versus cooling losses.…”

Section: Introductionmentioning

confidence: 99%

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Predicting global average thermospheric temperature changes resulting from auroral heating

et al. 2011

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[1] The total Poynting flux flowing into both polar hemispheres as a function of time, computed with an empirical model, is compared with measurements of neutral densities in the thermosphere at two altitudes obtained from accelerometers on the CHAMP and GRACE satellites. The Jacchia-Bowman 2008 empirical thermospheric density model (JB2008) is used to facilitate the comparison. This model calculates a background level for the "global nighttime minimum exospheric temperature," T c , from solar indices. Corrections to this background level due to auroral heating, DT c , are presently computed from the Dst index. A proxy measurement of this temperature difference, DT c , is obtained by matching the CHAMP and GRACE density measurements with the JB2008 model. Through the use of a differential equation, the DT c correction can be predicted from IMF values. The resulting calculations correlate very well with the orbit-averaged measurements of DT c , and correlate better than the values derived from Dst. Results indicate that the thermosphere cools faster following time periods with greater ionospheric heating. The enhanced cooling is likely due to nitric oxide (NO) that is produced at a higher rate in proportion to the ionospheric heating, and this effect is simulated in the differential equations. As the DT c temperature correction from this model can be used as a direct substitute for the Dst-derived correction that is now used in JB200, it could be possible to predict DT c with greater accuracy and lead time.

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Section: Derivation Of Dt C From Auroral Heatingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Predicting global average thermospheric temperature changes resulting from auroral heating

et al. 2011

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Energy coupling during the August 2011 magnetic storm

Huang

Sutton

et al. 2014

JGR Space Physics

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We present results from an analysis of high-latitude ionosphere-thermosphere (IT) coupling to the solar wind during a moderate magnetic storm which occurred on 5-6 August 2011. During the storm, a multipoint set of observations of the ionosphere and thermosphere was available. We make use of ionospheric measurements of electromagnetic and particle energy made by the Defense Meteorological Satellite Program and neutral densities measured by the Gravity Recovery and Climate Experiment satellite to infer (1) the energy budget and (2) timing of the energy transfer process during the storm. We conclude that the primary location for energy input to the IT system may be the extremely high latitude region. We suggest that the total energy available to the IT system is not completely captured either by observation or empirical models.

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Interhemispheric field‐aligned currents: Simulation results

2014

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We present simulation results of the 3-D magnetosphere-ionosphere current system including the Region 1 and Region 2 field-aligned currents, ionospheric currents, and interhemispheric field-aligned currents flowing between the northern and southern conjugate ionospheres in the case of asymmetry in ionospheric conductivities in two hemispheres. The model shows that the interhemispheric currents can be an important part of the global 3-D current system in high-latitude ionosphere, especially during summer-winter months, when in winter ionosphere they can be comparable and even exceed both Region 1 and Region 2 currents. An important feature of these interhemispheric currents is that they link together processes in two hemispheres, so that the currents observed in one hemisphere can provide us with information about the currents in the opposite hemisphere. Although the interhemispheric currents might play a notable role in the total 3-D current system, they have not been sufficiently studied yet. The study of the contribution from the interhemispheric currents into the total 3-D current system allows us to improve understanding and forecasting of geomagnetic, auroral, and ionospheric disturbances in two hemispheres.

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Response of the thermosphere to Joule heating and particle precipitation

Cited by 71 publications

References 24 publications

Predicting global average thermospheric temperature changes resulting from auroral heating

Predicting global average thermospheric temperature changes resulting from auroral heating

Energy coupling during the August 2011 magnetic storm

Interhemispheric field‐aligned currents: Simulation results

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