Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity

first_imgWe present observations from the Falkland Islands Super Dual Auroral Radar Network radar of the propagation of HF radio waves via the Weddell Sea Ionospheric Anomaly (WSA), a region of enhanced austral summer nighttime ionospheric electron densities covering the southern Pacific and South Americas region. This anomaly is thought to be produced by uplift of the ionosphere by prevailing equatorward thermospheric winds. Of particular interest are perturbations of the WSA-supported propagation, which suggest that during periods of geomagnetic disturbance, the ionospheric layer can be lowered by several tens of kilometers and subsequently recover over a period of 1 to 2 h. Perturbations can appear singly or as a train of two to three events. We discuss possible causes of the perturbations and conclude that they are associated with equatorward propagating large-scale atmospheric waves produced by magnetospheric energy deposition in the auroral or subauroral ionosphere. Changes in high/middle latitude electrodynamics during geomagnetic storms may also account for the perturbations, but further modeling is required to fully understand their cause.last_img read more

Women Attorneys Section and Diversity Committee Co-Hosted “Breaking Through Bias” Workshop

first_imgThe Evansville Bar Association Women Attorneys Section and Diversity Committee co-hosted “Breaking Through Bias” today with nationally known speakers Andie Kramer and Al Harris.  Over 100 women and men professionals attended the keynote lunch followed by an interactive workshop on the issue of overcoming gender bias in the workplace.   Co-chairs for the event were Meagan Brien and Trisha Dudlo.Andie and Al have worked with Fortune 100 companies; engineering and chemical associations, legal organizations, consulting firms, and many other businesses to raise awareness of the benefits of diversity and to present     techniques organizations and individuals can use to make diversity a positive reality.Pictures are attached. FacebookTwitterCopy LinkEmailSharelast_img