Aditya-L1: How Much Time Will It Take To Reach The Sun? How Was India's Solar Mission Named?

The Aditya-L1 mission is slated to embark on a journey lasting approximately 125 Earth days following its launch today. Its destination is the halo orbit encircling the L1 Lagrange point, situated at a distance of roughly 1,500,000 km (930,000 mi) from Earth.

While stationed in the halo orbit throughout its planned mission duration, the spacecraft will require a minimal stationkeeping cost ranging from 0.2 to 4 m/s per year. This 1,500 kg (3,300 lb) satellite is equipped with seven distinct scientific payloads, each tailored to diverse objectives.

These include the study of coronal heating, solar wind acceleration, coronal magnetometry, the origin and monitoring of near-UV solar radiation (which influences Earth's upper atmospheric dynamics and global climate), the connection between the solar photosphere, chromosphere, and corona, as well as in-situ characterisations of the space environment surrounding Earth, encompassing measurements of energetic particle fluxes and magnetic fields associated with solar wind and solar magnetic storms that can adversely affect space and ground-based technologies.

Aditya-L1's capabilities encompass observations of the Sun's photosphere, chromosphere, and corona. Furthermore, one of its instruments will investigate the flux of solar energetic particles reaching the L1 orbit, while a magnetometer payload will gauge fluctuations in magnetic field strength within the halo orbit around L1. These payloads necessitate positioning beyond the influence of Earth's magnetic field, rendering them unsuitable for the original Aditya mission concept, which proposed a low Earth orbit.

A pivotal enigma in solar physics revolves around the extreme temperature contrast within the Sun's atmosphere, where the upper atmosphere blazes at temperatures of 1,000,000 K (1,000,000 °C; 1,800,000 °F), while the lower atmosphere remains comparatively cooler at 6,000 K (5,730 °C; 10,340 °F).

Additionally, the precise impact of the Sun's radiation on Earth's atmospheric dynamics across various time scales remains elusive.

The Aditya-L1 mission aims to capture near-simultaneous images of distinct layers in the Sun's atmosphere, shedding light on the mechanisms governing energy transfer between these layers. In doing so, it seeks to provide a comprehensive understanding of the Sun's dynamic processes, addressing some of the outstanding questions in solar physics and heliophysics.

Aditya-L1: How Was India's Solar Mission Named?

Indian Space Research Organisation (ISRO), says it will take its first space-based mission to study the Sun, Aditya L1, four months to travel the distance to its destination.

The Aditya L1 mission is named after Surya, the Hindu god of the Sun. It will reach the L1 point, which is a gravitationally stable point between the Sun and Earth where the forces of gravity from both bodies balance each other out. This will allow the spacecraft to stay in orbit around the L1 point without needing to use any fuel.

The L1 point is named after Joseph-Louis Lagrange, an 18th-century Italian-born astronomer who first calculated its existence. There are five Lagrange points in the Sun-Earth system, and the L1 point is the closest to Earth.

The Aditya L1 mission will carry seven scientific instruments to study the Sun's atmosphere, including its corona, which is the outermost layer of the Sun's atmosphere. The mission is expected to help scientists better understand the Sun's activity and its impact on Earth.