IPS observations of heliospheric density structures associated with active regions

Hick, P., Jackson, B.V., Altrock, R., Woan, G. and Slater, G. (2000) IPS observations of heliospheric density structures associated with active regions. Advances in Space Research, 17(4-5), pp. 311-314. (doi: 10.1016/0273-1177(95)00591-2)

Abstract

Interplanetary scintillation (IPS) measurements of the ‘disturbance factor’ g, obtained with the Cambridge (UK) array can be used to explore the heliospheric density structure. We have used these data to construct synoptic (Carrington) maps, representing the large-scale enhancements of the g-factor in the inner heliosphere. These maps emphasize the stable corotating, rather than the transient heliospheric density enhancements. We have compared these maps with Carrington maps of Fe XIV observations (NSO, Sacramento Peak) and maps based on Yohkoh/SXT X-ray observations. Our results indicate that the regions of enhanced g tend to map to active regions rather than the current sheet. The implication is that active regions are the dominant source of the small-scale (≈ 200 km) density variations present in the quiet solar wind.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Woan, Professor Graham
• Authors: Hick, P., Jackson, B.V., Altrock, R., Woan, G., and Slater, G.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Advances in Space Research
• ISSN: 0273-1177
• Published Online: 12 April 2000