Numerical Study of Latitudinal Dependence and Propagation of Nighttime Medium-Scale Traveling Ionospheric Disturbances

Details Numerical Study of Latitudinal Dependence and Propagation of Nighttime Medium-Scale Traveling Ionospheric Disturbances Numerical Study of Latitudinal Dependence and Propagation of Nighttime Medium-Scale Traveling Ionospheric Disturbances

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa33a1445y&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA33A-1445

Physics

[2435] Ionosphere / Ionospheric Disturbances, [2439] Ionosphere / Ionospheric Irregularities, [2443] Ionosphere / Midlatitude Ionosphere

Scientific paper

Nighttime medium-scale traveling ionospheric disturbances (MSTIDs) often have an intriguing plasma density structure elongated from northwest to southeast (from northeast to southwest) and propagate southwestward (northwestward) in the northern (southern) hemisphere. Recent observations showed that MSTIDs appear in very wide latitude range, that is, from sub-auroral region to equatorial ionization anomaly [e.g., Ogawa et al., 2009]. As a generation mechanism of MSTID, the importance of the coupling between the Perkins instability in the F region and sporadic-E (Es)-layer instability in the E region has been presented with a three-dimensional numerical simulation [Yokoyama et al., 2009]. However, any latitudinal dependence of MSTID was not able to be studied because a dip angle of the geomagnetic field was fixed in their model. As an advanced study of Yokoyama et al. [2009], we have developed a new simulation model in which a non-orthogonal and non-uniform coordinate system is used. One coordinate axis is aligned with a dipole magnetic field line so that we can simulate the generation of MSTID in any latitude regions. Preliminary simulation using the new model has successfully reproduced the northwest-southeast density structure in the F region generated by the Perkins instability. We will discuss the latitudinal dependence of MSTID's generation and propagation based on our numerical results.

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