Profile of the 9.85-GHz Neutral Hydrogen Line Taking into Account the Zeeman Effect (Computations and Solar Observations)


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

The 9.85-GHz (3.04 cm) line of atomic hydrogen due to the 22P3/2–22S1/2 transition between levels of the hyperfine structure occupies a special place in the complex spectrum of the Sun. This is essentially the only hydrogen line that is expected in the solar radio spectrum. The promising nature of solar observations in the H3.04 line was first noted in 1952 by Wild, who calculated the line profile using a model for the “quiet” Sun characterized by a weak magnetic field (several Gauss). Computations of this line profile taking into account the strong magnetic fields in solar active regions (hundreds Gauss) are considered here. It is shown that the Zeeman effect leads to appreciable changes in the appearance of the line profile. This may help explain why searches for the H3.04 line have not led to any detections earlier. New observations of the Sun on the RATAN-600 telescope are analyzed with allowance for the Zeeman effect.

About the authors

A. F. Dravskikh

Special Astrophysical Observatory of Russian Academy of Sciences

Email: topchilona@yandex.ru
Russian Federation, St. Petersburg

N. G. Peterova

Special Astrophysical Observatory of Russian Academy of Sciences

Author for correspondence.
Email: peterova@yandex.ru
Russian Federation, St. Petersburg

N. A. Topchilo

Department of Astrophysics

Author for correspondence.
Email: topchilona@yandex.ru
Russian Federation, St. Petersburg

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2019 Pleiades Publishing, Ltd.