Solar-Wind Bulk Velocity Throughout the Inner Heliosphere from Multi-Spacecraft Measurements

Opitz, A.; Fedorov, A.; Wurz, P.; Szego, K.; Sauvaud, J.-A.; Karrer, R.; Galvin, A. B.; Barabash, S.; Ipavich, F. (2010). Solar-Wind Bulk Velocity Throughout the Inner Heliosphere from Multi-Spacecraft Measurements. Solar physics, 264(2), pp. 377-382. Springer 10.1007/s11207-010-9583-7

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We extrapolate solar-wind bulk velocity measurements for different in-ecliptic heliospheric positions by calculating the theoretical time lag between the locations. The solar-wind bulk velocity dataset is obtained from in-situ plasma measurements by STEREO A and B, SOHO, Venus Express, and Mars Express. During their simultaneous measurements between 2007 and 2009 we find typical solar activity minimum conditions. In order to validate our extrapolations of the STEREO A and B data, we compare them with simultaneous in-situ observations from the other spacecraft. This way of cross-calibration we obtain a measure for the goodness of our extrapolations over different heliospheric distances. We find that a reliable solar-wind dataset can be provided in case of a longitudinal separation less than 65 degrees. Moreover, we find that the time lag method assuming constant velocity is a good basis to extrapolate from measurements in Earth orbit to Venus or to Mars. These extrapolations might serve as a good solar-wind input information for planetary studies of magnetospheric and ionospheric processes. We additionally show how the stream-stream interactions in the ecliptic alter the bulk velocity during radial propagation.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute

UniBE Contributor:

Wurz, Peter

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering

ISSN:

0038-0938

Publisher:

Springer

Language:

English

Submitter:

Dora Ursula Zimmerer

Date Deposited:

09 Jun 2021 15:13

Last Modified:

09 Jun 2021 15:13

Publisher DOI:

10.1007/s11207-010-9583-7

BORIS DOI:

10.48350/154611

URI:

https://boris.unibe.ch/id/eprint/154611

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