IRIS⁺⁺ database: Merging of IRIS + Mark-1 + LOWL^*

¹ Département d'Astrophysique, UMR 6525, Université de Nice-Sophia Antipolis, 06108 Nice Cedex 2, France
² High Altitude Observatory, NCAR, PO Box 3000, Boulder, CO 80307, USA
³ Instituto de Astrofisica de Canarias, 38071 La Laguna, Tenerife, Spain
⁴ Dipartimento di Fisica dell'Università, Piazzale Aldo Moro 2, 00185 Roma, Italia
⁵ Astronomical Institute and Isaak Newton Institut of Chili (Uzbek branch), Astronomicheskaya-33, Tashkent-700052, Uzbekistan
⁶ Observatoire de la Côte d'Azur, Lab. Cassini CNRS UMR 6529, 06304 Nice Cedex 4, France
⁷ Center for Space Science and Astrophysics, Stanford University, Stanford, CA 94305, USA
⁸ Laboratoire d'Astronomie du CNCPRST, BP 1346, Rabat, Morocco

Corresponding author: D. Salabert, david.salabert@unice.fr

Received: 20 February 2002
Accepted: 13 May 2002

Abstract

The IRIS network has been operated continuously since July 1st 1989. To date, it has acquired more than a complete solar cycle of full-disk helioseismic data which has been used to constrain the structure and rotation of the deep solar interior. However, the duty cycle of the network data has never reached initial expectations. To improve this situation, several cooperations have been developed with teams collecting observations with similar instruments. This paper demonstrates that we are able to merge data from these different instruments in a consistent manner resulting in a very significant improvement in network duty cycle over more than one solar cycle initiating what we call the IRIS⁺⁺ network.