24 Feb 2023
 | 24 Feb 2023
Status: this preprint is currently under review for the journal ANGEO.

Velocity of magnetic holes in the solar wind from cluster multipoint measurements

Henriette Trollvik, Tomas Karlsson, and Savvas Raptis

Abstract. We present the first statistical study on the velocity of magnetic holes (MHs) in the solar wind. Magnetic holes are localized depressions of the magnetic field, often divided into two classes; rotational and linear MHs. We have conducted a timing analysis of observations of MHs from the Cluster mission in the first quarter of 2005. In total, 69 events were used; out of these, there were 40 linear and 29 rotational MHs, where the limit of magnetic field rotation was set to 50°. The resulting median velocity was 7.4 ± 45 km/s and 25 ± 42 km/s for linear and rotational MHs, respectively. For both classes, around 70 % of the events had a velocity in the solar wind frame that was lower than the Alfvén velocity. Therefore, we conclude that within the observational uncertainties, both linear and rotational MHs are convected with the solar wind.

Henriette Trollvik et al.

Status: open (until 07 Apr 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on angeo-2023-5', Martin Volwerk, 13 Mar 2023 reply
  • RC2: 'Comment on angeo-2023-5', Hadi Madanian, 20 Mar 2023 reply

Henriette Trollvik et al.

Henriette Trollvik et al.


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Short summary
The solar wind is in the state of plasma, and can exhibit a range of phenomena like waves and instabilities. One observed phenomenon in the solar wind is magnetic holes (MH). They are localized depressions of the magnetic field. We have studied the motion of MHs, by using the multispacecraft ESA Cluster mission. We derive their velocities in the solar wind frame, and find that both linear and rotational MH are convected with the solar wind.