# Aroon Down (AROONDOWN)

> QuantNexus indicator page for Aroon Down.

**Route**: `/quantnexus/indicators/aroondown/`

## What It Does

Aroon Down measures how recently a low was made within the lookback period. It helps identify the strength of downward trend pressure.

## Formula

Aroon Down reflects the time since the lowest low over `n` periods.

## Parameters

- `period` - default `14`
- `upperband` - default `70`
- `lowerband` - default `30`

## C++23 API

```cpp
#include <nonabt/indicators/aroondown.hpp>
auto aroondown = std::make_unique<nonabt::AROONDOWN>(data(), 14, 70, 30);
```

## Common Usage

- Use Aroon Down to measure downside trend recency.
- Combine with Aroon Up for trend direction.
- Use thresholds to detect strong downtrends.

## Practical Pattern

When Aroon Down is rising while Aroon Up is falling, downside momentum is usually increasing.