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Cornelis de Jager: In Memoriam
Cornelis (“Kees”) de Jager, the co-founder of the journal Solar Physics, passed away on 27 May 2021. He was an exemplary human being, a great scientist, and he had a large impact on our field. In this tribute, we...
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Book
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Chapter
Description and Classification of Prominences
Solar prominences are bright cloud-like structures when observed beyond the solar limb and they appear as dark filamentary objects which are termed filaments when seen against the solar disk. The aims of promi...
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Article
Editorial Appreciation
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Article
Solar Filaments and Photospheric Network
The locations of barbs of quiescent solar filaments are compared with the photospheric/chromospheric network, which thereby serves as a proxy of regions with enhanced concentrations of magnetic flux. The study...
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Article
Thin Threads of Solar Filaments
High-resolution images obtained in Hα with the new Swedish Solar Telescope at La Palma, Spain, have been used for studies of fine-scale threads in solar filaments. The widths of the thin threads are ≤0.3 arcse...
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Article
Filament activation and magnetic reconnection
A curved filament in a decaying active region (AR 8329) was observed on 9 September 1998 with a combination of several instruments. The main data base is a 4-hour long time series of 1 min cadence using the Lo...
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Article
On the Nature of Prominence Absorption and Emission in Highly Ionized Iron and in Neutral Hydrogen
We have studied the behavior of the emission in the highly ionized EUV lines Fe ix/x, 171 Å, Fe xii, 195 Å, and Fe xv, 284 Å observed in quiescent prominences. Kucera, Andretta, and Poland (1998) have explaine...
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Article
Modeling of prominence threads in magnetic fields: Levitation by incompressible MHD waves
The nature of thin, highly inclined threads observed in quiescent prominences has puzzled solar physicists for a long time. When assuming that the threads represent truly inclined magnetic fields, the supporti...
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Chapter
Reports on Astronomy 1996 from IAU Commissions 10, 12 and 49
The time period covered by this report (1 July 1993 – 30 June 1996) has seen the flawless launch and operation of SOHO, the full development of the Global Oscillation Network (GONG) and other seismology networ...
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Article
Flows in quiescent prominences
Earlier studies of quiescent prominences claim that there is a systematic downward directed motion of the small-scale structure. Disk observations, on the other hand, have detected mass motions both upwards an...
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Article
Filament oscillations as evidence for Alfvén waves
High resolution observations of quiescent filaments show oscillations that are strongly tied to their fine threads. It is shown that neither slow nor fast MHD modes may account for the observations, which rath...
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Chapter and Conference Paper
The Near-Infrared Capabilities of Lest
The Large Earth-based Solar Telescope (LEST) will be a powerful, next-generation telescope with unprecedented angular resolution, capable of highly accurate polarimetry of the Sun, covering the optical spectral r...
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Article
Filigree, magnetic fields, and flows in the photosphere
The interaction between small-scale magnetic fields and horizontal photospheric flows has been studied from observations of high angular resolution ...
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Article
Absolute redshifts in the C iv 1548 Å line in the transition region of the quiet Sun
Observations with the UVSP instrument on the SMM spacecraft were made at the polar limb and disk center for the accurate determination of Doppler shifts of the Civ 1548 Å emission line formed at 105 K in the tran...
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Article
The Prominence-Corona Transition Region in transverse magnetic fields
An emission measure analysis is performed for the Prominence-Corona Transition Region (PCTR) under the assumption that the cool matter of quiescent filaments is contained in long, thin magnetic flux loops imbe...
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Article
Vertical velocities and oscillations in quiescent filaments
Analysis of He i λ 10 830 Å spectral observations of a large, quiescent filament reveals a pronounced oscillatory behaviour of the vertical mass motion. The filament is situated in a quiet region more than 15° aw...
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Article
Structure and oscillations in quiescent filaments from observations in He i λ10830 å
Observations of two quiescent filaments show oscillatory variations in Doppler shift and central intensity of the He i λ10830 Å line.
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Article
Absolute flows in the solar transition region
It is the objective of the present study to establish an absolute scale for flows in the solar transition region in observations obtained with the UVSP/SMM. By use of the polar limbs as reference one finds tha...
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Chapter and Conference Paper
Distribution of velocities in the pre-eruptive phase of a quiescent prominence
High resolution Ca II K line spectra of a large quiescent prominence were obtained about one hour before a prominence eruption May 2nd 1974. The observations were made with the main spectrograph of the vacuum ...
